Rajopadhyaya (Nepali: राजोपाध्याय)is one of the top most Bramhan from Nepalese Caste System in Kathmandu Valley of Nepal. According to their own legendary history, the origination of Rajopadhyaya Brahmans is from Kannauj, Uttar Pradesh (previously known as Kanyakubja), one of the ancient Northern Indian cities with great political, religious, and cultural importance. The successive Muslim invasions in Kannauj and other surrounding areas during the eleventh and twelfth centuries forced many Hindus to migrate into nearby places including Nepal. The migration of Rajopadhyaya have great influence or relation to those Muslims invasions.
The most common religion of people with this surname is Shaiva Hinduism. Being a Bramhin caste, Rajopadhyaya is regarded as one of the high class castes in Hindu religion. The Rajopadhyayas belong to kanyakubja class of Brahmin Communities. Now most of the Rajopadhyayas are found in Kathmandu Valley and surrounding areas such as Kavrepalanchok, Sarlahi,etc. They are the priests of most of the temples in the Kathmandu Valley. Only the Rajopadhyaya and Chathariya jats of Newars are said to belong to gotras. All Rajopadhyaya Brahmans may use the alternative 'thar' name Subedi, which indicates that they belong to the Bharadvaja gotra . Most Chathariya are said to belong to the Kasyapa gotra. For the Newars, the gotra however has no special ceremonial entailment, aside from identifying oneself ritually, and has no exogamous entailment at all as even the Brahmans intermarry within the same gotra.
- The Rajopadhyaya's historical legend tells how in the distant past two Brahman brothers came to Nepal from Kannauj. Their names were "Alias Raj" and "Ullas Raj." Ullas Raj settled in the mountains, while Alias Raj settled in the Kathmandu Valley. Ullas Raj became a Parbatiya: (literally, a "hill dweller") because he settled in the mountains. Alias Raj became a Valley Bramhan because he settled in the Valley.
- Rajopadhyaya are priests of most of the temples in the valley, to mention few of the most popular ones, Kumbhewhwor Mahadev, Changu Narayan, Taleju Bhawani, Nyatapola (siddhilaxmi temple)