Sina may refer to:
- Chin (China), or Sina (Chinese 支那), old Chinese form of the Sanskrit name Cina (चीन)
- Shina (word), or Sina (Japanese 支那), old Japanese word for China
- Sinae, Latin name for China
- Sina Corp (新浪), Chinese company and website
- Sina, Albania, or Sinë, village in Dibër County, Albania
- Sina, Iran, a village in Bushehr Province, Iran
- Sina District, in San Antonio de Putina Province, Peru
- "Sina", a song by Brazilian singer Djavan
- "Soulfood To Go (Sina)", English title of a cover of this song by Manhattan Transfer (band)
- Sina and the Eel, a Samoan myth of origin
- Sina-1, an Iranian satellite launched on a Russian rocket in October 2005
- Sina class, designation of the Iranian missile boat Paykan
- Sina Bank, a private Iranian bank
- SINA
- Society for Indecency to Naked Animals, a hoax perpetuated by Alan Abel
- People
- Ibn Sīnā (c. 980 – 1037), Avicenna, a Persian physician, philosopher, and scientist
- Elvis Sina (born 1978), an Albanian footballer
- Nasser Sina (born 1962), a Kurdish veteran and journalist
- Than Sina, Cambodian politician
- Sina Ashouri (born 1988), an Iranian footballer
- Ali Sina (activist), pseudonym of the founder of Faith Freedom International, a secularist website with critiques of Islam