Aika may refer to:
- Aika (singer), a Japanese singer/songwriter
- Agent Aika, an anime OVA produced by Bandai Visual & Studio Fantasia
- Aika is a name for Aikakone, a Finnish musical group
- Aika is an ancient name of Troia (FG), Italy
- Aika (album)
- Aika is a song from the album Unified, by Super8 & Tab & BT
- Aika is a character, see List of Skies of Arcadia characters
- Aika is an Indian short film directed by Gulzar (lyricist) in 1984
- AIKA Online, an MMORPG
Aika is the second solo studio album by a Finnish singer-songwriter Aki Sirkesalo. Released by Sony Music Entertainment in 1996, the album peaked at number three on the Finnish Albums Chart.
Aika (pronounced "ah-ee-kah" and stylized "AIKA"),平原愛花（ひらはらあいか）is a Japanese singer/songwriter, currently residing in Los Angeles, California. She is known for her 2006 debut album Ai-Wo, with its songs "Orange Moon" and "Ai-wo", which reached the top 10 in Japanese charts on its first week of its release. Her second studio album is scheduled for release at the end of 2015. She co-wrote the gold-certified song "Path of Independence" for her sister, Ayaka Hirahara.