- O Solo Mio Travel
 - Providing tours for singles. - O'Brien's Rogue River Rafting
- Guided Oregon whitewater rafting trips on the Rogue River. Enjoy full-day or half-day rafting and kayaking trips, family raft camps or teen raft camps.
- O'Donnells Cottages and Canoeing
- Outdoor adventures and cottage rentals on the Miramichi River near Doaktown, New Brunswick.
- O'Leary Tours
- Creates tours and guides clients through Ireland. Packages include castles, race tracks, and golf courses.
- O.A.R.S. Whitewater Rafting
- Features whitewater river rafting in California and the Grand Canyon. Includes sea-kayaking and multi-sport adventure holidays.
- Oak Tank Outfitters
- Grand Canyon river rafting and hiking. Visit and enjoy the Hualapai Indian Reservation.
- Oasis Divers
- Caribbean beauty and small island charm. Includes diver packages and Grand Turk information.
- Oasis Overland
- Organises and leads overland trips in Africa and the Middle East.
- OasisAfrica
- Offering wildlife and photography safaris in South Africa, Botswana, Namibia, and Zimbabwe.
- Ocarina Expeditions
- Offers hiking, mountainbiking, tree climbing, spelunking, and wildlife viewing.
- Ocean Adventures
- Offering scuba diving tours and instruction in the Dutch Caribbean.
- Ocean Frontiers
- Offers places upon a ship circumnavigating the globe, via Terra Del Fuego, Cape Horn, Hobart, and Marlborough Sounds.
- Ocean Outfitters
- Offers whale watching, bear watching, and hot springs tours. Also specialising in Cougar Annie's Garden tours.
- Ocean River Sea Kayaking
- Offers guided sea kayaking tours, rentals, and walking in Abel Tasman National Park.
- Ocean Safaris Kayak Adventures
- Outfitters in Kailua-Kona, Hawaii.
- Ocean Sailing Expeditions
- Offers sailing adventures in the Indian and Pacific oceans on board the Belagaer.
- Ocean's Window
- OceanBLUE Yacht Charter Agents
- Yacht charter agents based in the U.K. specialising in bareboat and skippered sailing charters in Greece, Turkey, and Croatia.
- Ochils Tours
- Provides mini coach and bus day tours around Scotland. Includes trips to the Scottish Highlands, Fife, Crieff, Glencoe, and Loch Tay.
- Ocoee Adventure Center
- Specialising in whitewater raft trips.
- Ocoee Rafting, Inc.
- Adventure company offering guided whitewater rafting trips on the Ocoee River.
- Odyssey EcoTours
- Leads tours to Antigua, Chichicastenango, Pacaya volcano, and more.
- Odyssey Expeditions
- Lists worldwide travel programmes for teens featuring academic, art, sport, and special need categories.
- Odyssey Overland
- Travel company offering overland expeditions from London to Australia for adventure holidays, gap years, or career breaks.
- Odysseys Unlimited
- Offers worldwide tours for small groups of seniors.
- Off the Beaten Path
- Specialises in active, small group, cultural, speciality, and walking tours to the Loire Valley, Dordogne, Provence, Burgundy, Bordeaux, the French Riviera, and Paris, France.
- Off The Map Tours
- Offers travel information and adventure holidays in Mongolia, including biking, motorcycling, trekking, and cultural tours.
- Off-Road Experience
- Features an off-road school, driver training, excursions, and more.
- Offbeat Safaris
- Riding and Landrover safaris with luxury mobile tented camps in remote areas of Kenya.
- OFlo Catamaran Charters
- Offers a modern 40 foot catamaran sailing yacht available for surfing charters and holidays in the Caribbean and other destinations.
- Oiva Holidays
- Tour operator based in Delhi, offering adventure, cultural, mountaineering, and wildlife tours across India as well as Sri Lanka, Bhutan, and Nepal. Provides hotel bookings and various tour packages.
- Okavango Delta Safaris
- Tour operator offering safaris of the Okavango delta and river.
- Okavango Horse Safaris
- Offers 5-10 day itineraries in the Okavango Delta, Botswana, for up to 8 guests at a time.
- Okavango Tours and Safaris
- Specialist travel company providing tailor made beach holidays to the heart of Southern Africa.
- Okeechobee Outfitters
- Assembles national and international hunts, also provides foreign language guides.
- Old Colony and Newport Scenic Railway
- Historic tourist railroad operating a scenic train ride on 12 miles of track along Narragansett Bay in Newport RI.
- Old Country Tours Historical Tours
- Operates military and historical tours to Europe and the United States.
- Old Faithful Snowmobile Tours
- Offering multi-day snowmobile trips in the Greater Yellowstone area.
- Old Mexico Guided
- Offers guided hunting tours of Mexico with duck, quail, dove, and deer leases.
- Old Quebec Tours
- Offers minibus and full bus tours of Quebec City, Montmorency Falls, and rural Quebec, and land-sea tours for whale-watching and harbour cruises.
- Old Village Duck Club
- Blinds located between Claypool Reservoir and Greasy Slough.
- Olde Ipswich Tours
- Offering custom tours of New England and Europe, including wine and chateaux France tours, history, and nature. Spanish and French available.
- Olde Stonehouse Bed and Breakfast
- Includes information on short term rentals, mystery weekends, and more.
- Olé Spain Cultural Walking Tours
- Independent company offering cultural lectures, story telling, eating and walking explorations of Andalucia, Cataluña, and Extremadura.
- Olivia Cruises and Resorts
- Unique holidays for lesbian women.
- Olivier Tours
- Specialises in the Republic of South Africa, Namibia, Botswana, Malawi, Zimbabwe, and Zambia.
- Olyanna Travel
- Features tailor made tours to the Ukraine. City breaks in Kiev, Odessa, and Lviv, holidays in Crimea and Yalta, and special interest tours for art, architecture, and Jewish history.
- Olympia-Reisen Namibia
- Tour operator offering fly-in, cross-country, and tailor-made tours.
- Olympic Air
- Providing helicopter and aircraft rental, charter, and maintenance.
- Olympic Raft and Kayak
- Rafting and kayaking trips in Olympic National Park, Dungeness Bay, Lakes Aldwell and Crescent, and Freshwater Bay.
- Omineca Wilderness Adventures
- Offers fully guided fishing, wildlife photography, and outdoor tours with Frank and Herb. Upscale wilderness lodge in North Central British Columbia.
- On Course Travel Ltd
- Specialises in horseracing, motoring, and short break holidays in Ireland.
- On Safari
- Comprehensive source of information on African Safaris. In essence, everything one needs to know when travelling to East or Southern Africa.
- On the Loose Expeditions
- Offers guided outdoor adventure travel including Vermont hiking weekends, trekking in Nepal, backpacking, backcountry skiing expeditions, mountaineering, women's trips, yurt camping, and kayaking.
- On The Piste Ski Club
- Ski holidays to Les 4 Vallees, Switzerland. 400kms pistes, 100 lifts to 3330m.
- On The Piste Travel
- Offers skiing and snowboarding trips for adult groups, students, and schools.
- On Tour
- Group tours and cruises for seniors to destinations in United States, Europe, and Asia.
- One and All
- Tall sailing ship for charter or lessons.
- One Foot Abroad
- Walking holidays specialist offering trekking and hiking trips for groups and individuals throughout Europe.
- One Stop Travel Center
- Offers a variety of tours throughout Thailand and Indochina.
- One World Bicycle Expeditions
- Explore the beautiful backroads and fascinating villages of Thailand by bicycle.
- One World Tours
- Offers a broad range of holidays and tours to Egypt, Thailand, Jordan, HongKong, and China. Includes tours tailor made to fit client-specific dates, times, and budget.
- Oneira Holidays
- Offers hotels and self-catering villas, apartments, and studios for holidays on the Greek islands of Kefalonia and Ithaca.
- Ooraminna Bush Camp
- Experience outback Australia on a working cattle property. Horse riding and sight seeing in the Ooraminna Ranges.
- Open Road Tours
- Custom designed trips throughout the Southwest U. S. for organisations, families, and individuals. Day tours of the Valley of the Sun, multi-day trips, and adventure travel packages.
- Opera Breaks at the Royal Opera House, London
- Offers tickets and accommodation.
- Opera Breaks in Budapest
- Offers tickets and accommodation.
- Opera Select
- Offers opera tours within Europe. In Dutch.
- Operation Africa
- Specialises in tours to South Africa, Mozambique, Zimbabwe, Botswana, and Namibia.
- Operation Wallacea
- Nonprofit project that takes paying volunteer naturalists, trekkers, and divers to help scientists map the wildlife in remote rainforests and survey the coral and fish life of reefs in Indonesia.
- Operatur Patagonica
- Helping visitors enjoy the natural beauty of the area, especially Torres del Paine National Park.
- Orange Torpedo Trips, Inc.
- Guided whitewater raft and inflatable kayak trips in Idaho, Oregon, California, and Arizona, on the Salmon, Rogue, Klamath, North Umpqua, and Colorado rivers.
- Orange Vacations
- Provides tour packages that include a choice of hotel or resort and trips to Walt Disney World, Universal Studios, SeaWorld, and other destinations.
- Orca Enterprises
- Juneau, Alaska, tour operator Captain Larry offers whale watching, wildlife excursions, and fishing charters.
- Orcas Island Eclipse Charters
- Naturalist-guided whale watching tours.
- Orchid Heart
- Medical and wellness tourism agency offering high quality, low cost health care packages with exotic travel options in Thailand.
- Orchids & Egrets
- Offer general interest and customised group tours into the ecosystem of the Everglades.
- Oregon Llamas
- Pack llama breeder also offering commercial pack trips.
- Oregon River Experiences
- Offering guided half-day to five day trips on several rivers in Oregon and Idaho.
- Oregon Whitewater Adventures
- Offers a variety of trips on the McKenzie, Umpqua, Owyhee and more.
- Oregon's Northside Outfitters
- Big game guide and outfitter in eastern Oregon, hunting elk, whitetail and mule deer, cougar, bear, and coyote.
- Organ Cave, Inc.
- Offers tours of a cave that has over 40 miles of passageways and a Civil War history.
- Organic Tuscany
- Organic cooking holidays in Tuscany. Includes visits to local organic farms, cooking classes, wine and olive oil tastings, and tours of Florence and Siena.
- Orient Tours
- Contains travel tips, tour information, and regional history.
- Orient Tours UAE
- Offers city tours, desert safaris, and off-road tours for groups and individuals in the UAE and Oman.
- Orinoco Tours Venezuela
- Offers river expeditions, trekking, jeep tours, diving, and wildlife viewing.
- Orion River Expeditions
- Whitewater and scenic rafting trips throughout the Cascades.
- Orlando Excitement
- Offers Virgin holiday packages to five of the most popular theme parks in Orlando, including Universal's Island of Adventure.
- Osa Travel Friends
- Costa Rica wildlife nature tours on the biologically intense Osa peninsula. Osa Travel Friends provides guided rainforest hikes, tropical beach tours, and other affordable packages.
- Osprey Expeditions
- Guided fly fishing tours on private rivers and lake. Dry fly fishing is emphasized.
- Other Americas
- Photography tours of Mexico.
- OTOP France
- Specialises in tours throughout France in English, Spanish, German, and French.
- OTS Foundation
- NFP offering in-depth special interest educational travel programmes in Malta, featuring over 6,000 years of human history.
- Otter Reserves
- Guided fishing tours in Ganga-nayar and Yamuna river.
- Ouro Preto Tour Operator
- Tours of Brazil's major cultural destinations.
- Out For Adventure Sea Kayaking Vacations
- Offers sea kayaking tours and trips from Vancouver Island, British Columbia, Canada. Kayak with killer whales, explore Desolation Sound, and more.
- Out on the Salty Seas
- Sailboat chartering in sunny Greece. All you wanted to know, plus pictures, comments, clickable maps, links.
- Outback Adventures
- Guide service and rental shop specialising in kayaking, backpacking, and climbing in California.
- Outback Tours
- Backcountry safaris following the early pioneers and gold seekers in the Queenstown Southern Lakes area of New Zealand.
- Outback Wilderness Adventure
- Offers two to ten day guided dogsled tours in Sweden. Ice fishing and cross country skiing available.
- Outdoor Adventure
- Offers surfing, windsurfing, and multi-activity holidays at Widemouth Bay.
- Outdoor Adventure Holidays
- Provides abseiling, hiking, rafting, horse riding, mountain bike riding, and rock climbing adventures in Australia. Package includes all activities, meals, and accommodation.
- Outdoor Adventures Rafting
- On the Ocoee River.
- Outdoor Adventures Sport Fishing
- Outdoor Adventure Sport Fishing provides guided fishing trips throughout Northern California including the Sacramento River, Smith River, Feather River, and Shasta Lake for salmon, trout, and steelhead. Includes photos, contact info, and daily fishing report.
- Outdoor Aventures
- Offers whitewater river rafting trips in California, Oregon, and Idaho.
- Outdoor Excursions
- Offering rafting, tubing and kayaking instruction and adventure travel in the D.C. area.
- Outdoor Pursuits UK
- Offers paintball, air pistol and clay pigeon shooting, quad biking, bungee jumping, archery, and more.
- Outdoor Safaris
- Outfitter and guide booking service for hunting, fishing, and whitewater tours, including guest ranch stays, around the world.
- Outdoor Travel Adventures (OTA)
- Offering outdoor team adventures including climbing, rafting, kayaking, and multi-sport trips worldwide.
 Outdoorinasia
- Outdoor adventures, team building, and incentive programmes for corporations. Specialises in horse riding, treasure hunts, sailing, and motorbiking in Singapore and Malaysia.- OutdoorNet
- Global outdoor activities centre serving companies who wish to advertise and introduce products, services, and accommodations online.
- Outdoors Unlimited Grand Canyon Rafting
- Offers 5 to 15 day non-motorized whitewater rafting trips on the Colorado River through the Grand Canyon. Authorised concessionaire of National Park Service - Grand Canyon.
- Outer Edge Expeditions
- Active adventure travel to remote destinations throughout the world.
- Outland Adventures, Inc.
- Arranges hiking tours of New Zealand's South Island.
- Outland Expeditions
- Offers Ocoee river rafting, hiking and climbing excursions in Tennessee.
- Outlaw Land and Cattle Company
- Offers a posse week and cattle drives at the N Bar Ranch in Southwest New Mexico.
- Outlaw Rivers and Jeep Tours
- Offering jeep, rafting, snowmobile, and sleigh ride tours.
- OutofDoors.com
- Adventure tour operator directories.
- Outstanding in the Field
- Combining farm dinners and tours at locations across the country.
- Outward Bound (6)
- Outward Bound@
- Outward Bound Australia
- Adventure education and personal development in Australia. Courses for individuals, companies, and schools.
- Outward Bound Belgium
- Development training organisation which utilises experiential learning in the outdoors to work on issues such as teambuilding, leadership, communication, and more.
- Outward Bound Canada@
- Outward Bound Hong Kong
- Outward Bound New Zealand
- Course schedule, enrolment details, and gallery.
- Outward Bound Romania
- Adventure education and personal development in Romania. Courses for individuals, companies and schools.
- Outward Bound Singapore
- Provides youths with challenging, fun, and safe outdoor activities to develop their resilience, tenacity, and team spirit.
- Outward Bound UK
- Offers outdoor courses and expeditions for schools, colleges, professional groups, and individuals in centres throughout the U.K.
- Ouzel Expeditions
- Float fishing adventures in Alaska & Kamchatka, Russia.
- Ovalau Watersports
- In Levuka, Ovalau, Fiji. Features information about local accommodation and activities, including treks in the village and rainforest.
- Over the Top & Heli Guides
- Helicopter ski and snowboard touring companies provding services in New Zealand's mountain wilderness.
- Overland Tours
- Offers bus and train tours to destinations throughout the United States.
- Overland Trail, The
- Former Southern Pacific lounge car with barbershop available for stationary and live charters between Los Angeles and San Diego.
- Overseas Motorhome Tours, Inc.
- Offers tours and Caravan rental throughout Europe.
- Overture Charters
- Charters offered in the Marlborough Sounds for holidays, team building, corporate functions, weddings, and social events.
- Oxford Literary Tours
- Five-day literary study courses based in the heart of Oxford. Aims to enhance close-reading and provoke thoughts.
- Oz E International
- Information about studying at Australian English colleges and schools. Specialises in study tours and also offers surf lifesaving, diving, and other sport programmes.
- Oz Experience
- Alternative transport network offering get on get off (GOGO) system throughout Australia.
- Oz Snow Adventures
- Offers all inclusive two and three day snow trips from Sydney to the Snowy Mountains. Specifically for backpackers and students.
- Oz-Trek Tours
- Experience unspoiled wilderness through the forests, mountains, and beaches near Batemans Bay on the South Coast of New South Wales.
- Ozark Fly Flinger
- Guided McKenzie drift boat fly fishing on Arkansas' White River.
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