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 is an MMORPG.
• AIKA  is an Information Technology organization based out of Saudi Arabia.

is an adventure anime OVA series produced by Studio Fantasia, and directed by Katsuhiko Nishijima. The series follows Aika Sumeragi, a salvager for hire who gets caught up in a plot for world domination. The series was released in Japan from 1997-1999. The anime was initially licensed by Central Park Media, but was later licensed by Bandai Entertainment. The series is well known for its copious amounts of fan service, specifically the camera angles on panties of the many female characters that populate the show. On April 25, 2007 the first volume of the three-part prequel OVA AIKa R-16: Virgin Mission, detailing Aika's time when she was 16 years old, was released in Japan. A remastered version of the original series was released also, along with a special live-action edition of Agent Aika. In 2009 the OVA AIKa ZERO with 19-year-old Aika was released.

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 is an MMORPG.
• AIKA  is an Information Technology organization based out of Saudi Arabia.

is an adventure anime OVA series produced by Studio Fantasia, and directed by Katsuhiko Nishijima. The series follows Aika Sumeragi, a salvager for hire who gets caught up in a plot for world domination. The series was released in Japan from 1997-1999. The anime was initially licensed by Central Park Media, but was later licensed by Bandai Entertainment. The series is well known for its copious amounts of fan service, specifically the camera angles on panties of the many female characters that populate the show. On April 25, 2007 the first volume of the three-part prequel OVA AIKa R-16: Virgin Mission, detailing Aika's time when she was 16 years old, was released in Japan. A remastered version of the original series was released also, along with a special live-action edition of Agent Aika. In 2009 the OVA AIKa ZERO with 19-year-old Aika was released.