Himalayan Buddhism is a term used to collectivly refer to the Buddhist schools of Tibet

Tibet

Tibet is a plateau region in Asia, north-east of the Himalayas. It is the traditional homeland of the Tibetan people as well as some other ethnic groups such as Monpas, Qiang, and Lhobas, and is now also inhabited by considerable numbers of Han and Hui people...

, Nepal

Nepal

Nepal , officially the Federal Democratic Republic of Nepal, is a landlocked sovereign state located in South Asia. It is located in the Himalayas and bordered to the north by the People's Republic of China, and to the south, east, and west by the Republic of India...

, Bhutan

Bhutan

Bhutan , officially the Kingdom of Bhutan, is a landlocked state in South Asia, located at the eastern end of the Himalayas and bordered to the south, east and west by the Republic of India and to the north by the People's Republic of China...

 and those practiced in the Indian Himalayan regions of Ladakh

Ladakh

Ladakh is a region of Jammu and Kashmir, the northernmost state of the Republic of India. It lies between the Kunlun mountain range in the north and the main Great Himalayas to the south, inhabited by people of Indo-Aryan and Tibetan descent...

, Himachel Pradesh, Sikkim

Sikkim

Sikkim is a landlocked Indian state nestled in the Himalayan mountains...

 and Arunachel Pradesh.

Himalayan Buddhism includes:

• Tibetan Buddhism
  Tibetan Buddhism
  Tibetan Buddhism is the body of Buddhist religious doctrine and institutions characteristic of Tibet and certain regions of the Himalayas, including northern Nepal, Bhutan, and India . It is the state religion of Bhutan...
  
  
  • Nyingma
    Nyingma
    The Nyingma tradition is the oldest of the four major schools of Tibetan Buddhism . "Nyingma" literally means "ancient," and is often referred to as Nga'gyur or the "old school" because it is founded on the first translations of Buddhist scriptures from Sanskrit into Tibetan, in the eighth century...
    
    
  • Sakya
    Sakya
    The Sakya school is one of four major schools of Tibetan Buddhism, the others being the Nyingma, Kagyu, and Gelug...
    
    
  • Kagyu
    Kagyu
    The Kagyu, Kagyupa, or Kagyud school, also known as the "Oral Lineage" or Whispered Transmission school, is today regarded as one of six main schools of Himalayan or Tibetan Buddhism, the other five being the Nyingma, Sakya, Jonang, Bon and Gelug...
    
    
  • Geluk
• Bhutanese Buddhism
• Newar Buddhism
  Newar Buddhism
  Newar Buddhism is the form of Mahayana-Vajrayana Buddhism practiced by the Newar ethnic community of the Kathmandu Valley in Nepal. It has developed unique socio-religious elements, which include a non-monastic Buddhist society based on a caste system and patrilinial descent...
  
  

All these Buddhist traditions are closely related historically and all include practices of both the Mahayana

Mahayana

Mahāyāna is one of the two main existing branches of Buddhism and a term for classification of Buddhist philosophies and practice...

 and Vajrayana

Vajrayana

Vajrayāna Buddhism is also known as Tantric Buddhism, Tantrayāna, Mantrayāna, Secret Mantra, Esoteric Buddhism and the Diamond Vehicle...

traditions of Buddhism.

Sources