Aahaa Ethanai Azhagu () is a 2003 Indian Tamil language romance film directed by Kanmani in his debut. The film stars Mithun and Charmy and was produced by J S Pankaj Mehta. Aha Ethanai Azhagu also has Nassar, Ranjitha, Fathima Babu, Pyramid Natarajan, Devan, Dhamu, Karunas and Pallavi in the cast, with popular Kannada actress Bhavana in an important role. This was Charmy's last film in Tamil for the next 12 years, until she made a comeback in 10 Endrathukulla (2015).
Music was composed by Vidyasagar. He introduced Sujatha Bhattacharya, better known as Madhushree, to Tamil cinema through this film.
Sify wrote, "This is yet another stale love story, which is far from having logic or sense". Malini Mannath Chennai Online wrote "It's a fairly average entertainer, but what is commendable is that the director does not waste much time in moving the story forward, by too many of those 'accidental encounter' type of scenes. He keeps the pace going, removing each hurdle as it crops up in the story, and moves to the climax briskly". Malathi Rangarajan of The Hindu wrote, "Little else can be said about a film that has neither major gaffes nor unforgettable highlights". R. S. Anthanan of Tamilcinema.com called the film as just another pebble taken from the ocean of love.