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
Italy

Location

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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An adventure trekking company in the Himalayan countries Nepal, Tibet, Bhutan and India offers verities of activities such as Trekking, Peak Climbing, Expedition.

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A professional Tibet tour operator based in Lhasa, Tibet and has one operating office in Lhasa and a sales office in Chengdu which is the biggest international metropolis in western China and convenient gateway city to Lhasa. It specializes in all kinds of Tibet travel services in and around Lhasa, including Tibet private and group tours, Tibet train and air tickets booking, hotels booking, etc.       
As one of the earliest Tibet travel agencies, Tibettravel.Org know this land on the roof of the world - its people, religion, culture, mountains, roads, lakes; the hotels, restaurants, museums, little shops and so on. It will give you up-to-date information about Tibet. It has provided services to thousands of foreign guests in the past ten years and has great prices for it has a good relationship with relevant companies, like railway station tickets office, air companies, hotels.

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Footprints Nepal Travels and Tours will be able to organize almost any trip and adventure in Nepal.

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A real Italian specialist for active trips all over Italy. Whether it be walking tours, cycling trips or sea-kayaking, they offer unsurpassed active adventures. Whether you are keen walker or want a stroll with a view and some good food, they have the right vacation for you! Explore Italy with the Specialists!Walking & cycling is the best way to see and know our country. Genius Loci Travel has selected the best spots for you!

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As the leading Tibet travel agency, Tibet Discovery makes travel to Tibet easy. With the benefit of their know-how, you will experience far more at a lower price, all free from the frustrating mix-ups and mistakes that might otherwise keep you from immersing yourself in your journey

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Raj Bala Treks & Expedition is a pioneer adventure travel company based in Nepal. Specialized in Trekking in Nepal, Climbing & Mountaineering Expeditions, cultural tours, Kathmandu sightseeing tours, Nepal family holidays, Jungle safari tours, Rafting, Nepal adventure trips for women group travelers & other adventure holidays along with any kinds of special interest tours.

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Hunza Adventure Tours, Pakistan is one of the leading adventure companies in Pakistan. Specialised in giving a high quality service to all clients, either those travelling individually or those in groups. They can organize mountaineering, Treks, Expeditions, Jeep Safaris, Camel and Yak Safaris, Silk Road Cycling and Mountain Bike Tours. The highly-skilled and experienced team of local guides, porters, drivers and cooks will ensure your journey is safe, smooth and trouble-free. Whether it is experiencing Pakistan's awe-inspiring and breath-taking scenery amid three of the mightiest mountain ranges in the world, travelling through the beauty of lush green valleys awash with the heady aroma of a miriad of wild flowers or choosing a Cultural tour to reveal the long and rich history and diversity of this extraordinary country, they can make your journey more than just memorable.

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Altitude Randonnee Trekking is a government authorized trekking agency established with the experience and professional team of mountain guides, cooks and porters who have been involving in trekking, travel and tourism sector since 1996. Altitude Randonnee has been continously operating adventure activities in the Himalayas since the company's establishment. Specialized in trekking, peak climbing, Himalayan expedition, white water rafting, bungy jumping, paragliding etc.

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Himalayan Eco Treks and Travel is synonym to guided safe and reliable trekking and travel services to Mount Everest Base Camp trek, Annapurna Base camp Trekking and as a whole Trekking and Tours in Nepal. Their 14 years of active services enhance all our operations sharp and cheerfully welcomed.

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In operation since 1995 and helping travelers from around the world to determine the natural beauties and cultural resources of Nepal & Tibet as a guide & operator. From impartially famous Nepal trekking to the Everest Base Camp, to a religious tour of Tibet whatever you're purpose and whatever your situation, Green Valley Nepal Trek can make it happen.

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Founded in March, 2008 Dos Manos offers the enthusiasm of a young and new agency, with the experience of our capable and professional bi-lingual staff. Focusing on tours and excursions in Argentina, Dos Manos Argentina offers a wealth of opportunities for making your visit to Argentina unforgettable.