Thapa (; IAST:Thāpā) is a family name or surname used by Nepalese belonging to both Magar caste within Khas people of Indo-Aryan group and Magar caste of Sino-Tibetan group.

Thapa was a title given to warriors in the ancient Khas Kingdom.Both Magar Thapa and Kshetri Thapa has done remarkably significant for Nepal.Magar Thapa who servers the British Army,Indian Army and Nepali Army in abundance are the main warriors for Nepal unification.The father of Greater Nepal Shreepach Prithivi Narayan Shah told to be a Magar King.In present Nepal both Thapa Kshetri and Thapa Magar are doing great in Politics and enhancing National Pride.According to many famous Historian,all the Khas of Nepal were originated in the western region of Nepal from the Mongolian community of Magar and Gurung</ref-youtube video on Shah Dynesty>.This is the main reason the so called Cheetri in Nepal has Magar and Gurung caste and genetically and physically alike the Magar and Gurung. It is proved many inscriptions in the present day region of Old Khas Kingdom. There were names of Thapa warriors in pillar inscription as:
 The above inscription also proved that Thapas and Khadkas (Khadgas) had same Kshatriya father but their actual clan name was not given.

Thapas has been involved in politics of Nepal for long time. Thapas were prominent military heads in various princely states in ancient Nepal. Thapas led military and civil administration in the unified Kingdom of Nepal after 1806 AD. Bhimsen Thapa of Bagale Thapa clan rose to prominence after the assassination of King Rana Bahadur Shah of Nepal by King's step-brother in 1805 AD. After the event, an investigation was run by Bharadars (Ministers) which caused massacre of 55 senior officers at Bhandarkhal garden by Thapa Kaji (ministers) group making them as most dominant faction in Nepalese politics.
.It would be true to say that History has been written by the Brahamin which underestimated and burried the history of all the other beautiful community of Nepal.
After Bhimsen rose to power, member of another Thapa family, Bada (senior) Kaji Amar Singh Thapa and his family were added to make Thapa Khalak dynasty stronger. Large number of Thapa leaders took part in Anglo-Nepalese War in 1814-16 AD. The immediate family of Bhimsen and Senior Kaji Amar Singh took over all the military commands in that war. Another unrelated warrior Bhakti Thapa also led the war at Deuthal aged 71 and died too. Thapas were out of power after the rise of Rana dynasty who were blood relatives of Thapas. Later Panchayat government of Nepal that began in 1961 AD saw large number of Thapas in the cabinet.

Khas Kshatri Thapa
Khas Thapa or Chhetri/Kshatri Thapa are Khas people of Indo-Aryan group. They are categorized into Kshatriya in Hinduism. They follow Hinduism and are divided by Khas clans and Hindu Gotra system. The clan names of Khas Kshatri Thapas are: Bagale Thapa, Punwar Thapa, Godar Thapa, Lamichhane Thapa, Suyal Thapa, Kalikote Thapa, Hrikshen Thapa, Khulal Thapa, Deoja Thapa, Thakuryal Thapa, Gamle Thapa, Sonal Thapa, and many others.

Bagale Thapa

Bagale Thapa is the most prominent clan within Khas Thapa. They fall under Atreya Gotra in Hinduism. The most famous Thapa Khalak dynasty of Prime Minister Bhimsen Thapa in the Nepalese politics belonged to this Bagale Thapa clan. They trace their origin to legendary Khas King Kalu Thapa.

Puwar Thapa

Puwar Thapa is also a clan within Khas Thapa. They claim descent from Parmar/Punwar Rajputs of Rajasthan.They fall under Kapil Gotra in Hinduism.The most famous Thapa Khalak dynasty of warrior Bhakti Thapabelongs to this Puwar Thapa.

Godar Thapa

Godar Thapa clan is also populous Khas Kshatri clan. They belong to Kashyap Gotra in Hinduism.

Magar Thapa

Magar Thapa or Thapa Magar are member of Magar caste which falls under Sino-Tibetan or Tibeto-Burman group. They speak Magar language and follow tradition of Magar caste. They can be found as core soldiers in Gurkha armies around the world.They also served as one of the six noble clans in the thargah of King prithvi Narayan Shah and were prominent nobles until the kot massacre.

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