Alaina is a feminine given name. Notable people with the name include:
- Alaina Bergsma (born 1990), American volleyball
- Alaina Burnett (born 1977), Canadian voice actor
- Alaina Capri (born 1939), Russ Meyer actress who appeared in Common Law Cabin and Good Morning and... Goodbye!
- Alaina Coates (born 1995), American basketball player
- Alaina Huffman (born 1980), Canadian film and television actress, also known professionally as Alaina Kalanj
- Alaina Johnson (born 1990), American artistic gymnast
- Alaina Kwan (born 1998), American artistic gymnast
- Alaina Lockhart (born 1974), Canadian politician
- Alaina Petty (2003–2018), one of the 17 victims who was killed in the Stoneman Douglas High School shooting
- Alaina Reed Hall (1946–2009), American actress best known for her roles as Olivia on the TV series Sesame Street
- Alaina B. Teplitz (born 1969), American politician
- Alaina Williams (born 1990), American trampoline gymnast