Aha! or AHA! may refer to:
- AHA! A Hands-On Adventure, a children's museum in Lancaster, Ohio, US
- Aha!, a defunct American regional airline brand
- Aha! (company), an American software company
- Aha! (film), a 2007 Bangladeshi film
- Aha! Insight (1978), a book by Martin Gardner
- Aha! (tabloid), a newspaper published in the Czech Republic
- Aha! , an information and education TV program in the Philippines
- "Aha!", a song by Imogen Heap
