| Siva Senai | |
| Native Name: | சிவா சேனை |
| Colorcode: |
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| Abbreviation: | |
| Leader: | Maravanpulavu Sachchithananthan |
| Founder: | Maravanpulavu Sachchithananthan |
| Wing3 Title: | ECSL status |
| Wing3: | Registered |
| Wing4 Title: | Armed wing |
| Wing4: | Siva Senai (H) |
| Ideology: | Hindutva Hindu nationalism Shaivism Right-wing populism |
| Position: | Right-wing |
| Religion: | Hinduism |
| Seats1 Title: | Parliament of Sri Lanka |
| Seats2 Title: | Sri Lankan Provincial Councils |
| Native Name Lang: | tl |
| Seats3 Title: | Local Government |
| Symbol: | Nandi |
| Flag: | Nandi_flag.png |
| Country: | Sri Lanka |
Siva Senai is a Hindu nationalist political group in Sri Lanka formed to protect the interests of Sri Lankan Tamil Hindus. The group was founded on 12 October 2016. Maravanpulavu Sachchithananthan, a former United Nations official, is the founder of the group, which has received encouragement from the Indian political party Shiv Sena. Siva Senai spearheaded an initiative in December 2017 to allow Sri Lankan pilgrims to visit Chidambaram in Tamil Nadu, India. The group has also actively advocated against cattle slaughter in Sri Lanka.
In 2018, supporters of Siva Senai held protests in Jaffna against cattle slaughter. It also protested against Muslim teachers in Hindu schools wearing Abaya, believing it to be an attempt of Islamisation of Hindus.[1]