Of course besides information about trekking routes www.trekking-world.com also provides information about trekking agencies which can organise a trek for you in one of the listed countries. 

The best way to find relevant trekking agencies is to either use the navigation menu on the left side to find the country, region or city/village of your choice or use the search box in the upper right corner by typing the country, region or city/village of your choice in combination with the term "trekking agencies".
 
Below you can also find a list of trekking agencies in some of the most visited countries on this website:
 
Nepal
India
Bhutan
Spain
Tanzania
Austria

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Encounters Nepal comprises a team of experienced professionals who have in the past 8 years worked for a range of trekking agencies. Firstly we provide you with drinking water on all treks ensuring that your impact on the environment is minimized. Secondly, we allocate at least 5% of our profits to local charities. This means that you are contributing directly to the development of communities who might otherwise not have benefited from your visit. We can deliver our own exceptional standard of service; something we believe has become diluted in the explosion of trekking agencies available in Kathmandu alone.

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Asian Heritage Treks & expedition (p) ltd. is established to be your best companion and to give you a pleasant and exotic experience of Nepal, Tibet, India, Bhutan, and Sikkim. They will continually strive to deliver to their customers’ levels of service consistently exceeding their expectations in travel through the Himalaya within a framework of safety and comfort in travel and adventure experiences, bound by a commitment to the environment and respect for local cultures.

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In the early nineties no one would have dreamed of a Nepalese woman guiding a trek. Nepalese society is ruled by the Orthodox Hindu religion where women are considered second-class citizens.
Since 1993 Lucky, Dicky and Nicky Chhetri, three Nepalese sisters, were running a restaurant and a lodge in Pokhara. They had the opportunity to meet women from all over the world and came across some unhappy and frightened solo women travelers who had had bad experiences with their male guides. Upon hearing these stories, they felt sad and decided to do something immediately. With urging from friends, they gathered up all courage and entered into this uncharted territory.

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Travel agency made up of professional team members. They have been in the field of adventure trekking, surface and heli tours in Nepal for a decade. As Nepal encompasses mystique Himalayas, birth place of Lord Buddha, historical cities, deep jungles, etc; hundred thousands of foreigners visit Nepal every year. In the context of number of visitors going up, Thamel Travels and Tours has been focusing on quality services at very reasonable prices. Thamel Travels and Tours will help you plan your tour as your time and money permit. There are different types of tours packages beginning from one day Kathmandu valley tour/hiking to months long adventure trekking and mountain climbing.

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France Outdoors offer guided adventure holidays (Guided hiking holidays, activity trips, winter walks, skiing and snowshoeing vacation) in the French Alps at your own pace, for families and individuals. They propose a wide range of options from full board in hotels to self catering. You prefer to enjoy a day or more on your own? They offer optional activities to those included in their packages. Try white water rafting, paragliding and much more!

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Trans-Pakistan was formed in 1990 by a team of highly experienced and qualified travel industry professionals who have over the past 25 years contributed pioneering work in this field, through numerous new and exciting ideas in adventure and cultural tourism throughout Pakistan. Trans-Pakistan is based in Islamabad, the capital of Pakistan, which lies at the foothills of the great Himalayas and is also the gateway to the enchantingly beautiful Northern Areas of our country.
It is a service-oriented company firmly believing in providing quality services with safety and comfort of their guests being the first priority. You can only enjoy your holidays if at ease and relaxed, knowing that the planning for your holidays has been done meticulously with your safety and well-being in mind. Because they do not compromise safety over cost, therefore, they are not the cheapest in the market but very reasonably priced considering that they provide the best available transport, good quality equipment, highly trained guides and cooks, a hygienic field kitchen with plenty of quality food and a personalized service.

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Nepal Alternative Treks & Expeditions is a Nepal government authorized trekking and Expedition Company, who operates quality trekking in Nepal at competitive prices.

Nepal Alternative Treks & Expeditions organize a variety of Nepal adventure tours and sightseeing activities, carefully designed to take their guests to exotic destinations in the Himalayas.

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TibetCtrip is a fast developing Tibetan Travel Agency and tour operator based in Lhasa since 2003. They bid unbeatable offers for their clients and provide Professional Tibet travel service. This agency arranges full service of Tibetan tour guides, drivers, vehicles, entrance tickets, accommodations, Qinghai Tibet Railway tickets, air tickets, Tibet Travel documents of Permits, visas, etc. Enjoy your Tibet Vacation with a local Tibetan tour operator!

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Kilimanjaro Travel and Safari Adventures features safari tour trips to unveil Tanzania wilderness area, to see maximum wild animals, habitats, beach areas, different tribes, mountains, ecotourism, climbing and hiking, walking safaris, nature trekking and much more.
Discover Africa, as Tanzania is less travelled country but with most stunning and fascinating scene areas.

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The Inca Trail is a Hiking route through the mountains near Cusco Peru, which ends at the Inca city of Machu Picchu. Find Trekking Information about the Inca Trail, which can be organized by Dos Manos, a travel agency founded in 2003, which offers the enthusiasm of a relatively new agency, with the experience of capable and professional bi-lingual staff. Focusing on tours and excursions in the Cusco and Southern Peru area, they offer a wealth of opportunities for making your visit to Peru unforgettable..

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Highland Expedition is an adventure tour company operated by a group of experienced Tibetan people who are from different parts of Tibet. Highland Expedition was established in 1993 in Lhasa, the capital city Tibet. They are one of the real specialists in Tibet tours; providing deluxe, standard and budget custom designed tours all around the Tibetan highland. Local tour operators based in Lhasa and specialized in all kinds of travel services in Tibet, China and Nepal. The employees live in the Tibetan Highlands and are very knowledgeable about Tibet's amazing land features, water bodies, religions, cultures and many more aspects of the country.
The mission of Tibet Highland Expedition is to make you experience all these lovely Tibetan Highlands through different means of adventures, making your vacation in the Himalayan region exciting.
Professionals in Tours, Treks, Mountain biking and much more.
Highland Expedition is fully responsible for your travel service based on the agreement which you choose.

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Explore the lesser known tribal land or wander through pristine beauty of India's North Eastern states. Bhagirathi Tour & Travel has an impressive range of tours which they can deliver in most cost effective terms. They understand the little things that can transform a tour to more rewarding, pleasant and memorable holiday!!

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The Company was established in 1982 and so having an experience of almost two decades, it is engaged in organising holiday trips to different parts of the country including Organising Conferences, arranging educational tours of leading educational institution of Dehradun, Mussoorie, Delhi, Ajmer, Gorakhpur, Bhivani, Hissar and Pilani. They are specialised in pilgrimage tours to the holy shrines of Yamunotri, Gangotri, Kedarnath and Badrinath. We also specialise in arranging adventure tours like Trekking, Mountaineering , River rafting, Skiing, and others in Garhwal Himalayas, Himachal Pradesh and Ladakh region

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Xplore arranges all kinds of tours and trekkings in India