"Ain't It Funny" is a 2001 single by Jennifer Lopez.
Ain't It Funny may also refer to:
- "Ain't It Funny" (Murder Remix), a remix of the song by Jennifer Lopez
- Ain't It Funny, a 1972 album by Anthony Newley
- "Ain't It Funny", a 2003 song by Soledad Brothers from Voice of Treason
- "Ain't It Funny", a 1998 song by Enuff Z'Nuff from Paraphernalia
- "Ain't It Funny", a 2012 song by George Jackson from The Jeb Loy Nichols Special
- "Ain't It Funny", a 1975 song by Peter Goalby
- "Ain't It Funny", a 1996 song by Ken Munshaw from Human Condition
- "Ain't It Funny", a 1994 song by Branford Marsalis from Buckshot LeFonque
- "Ain't It Funny", a 1999 song by Brainstorm
- "Ain't It Funny", a 1962 song by Gerri Granger
- "Ain't It Funny", a 1978 song by Colin Blunstone
- "Ain't It Funny", a 2016 song by Danny Brown from Atrocity Exhibition