Mr. Big is an American hard rock supergroup, formed in Los Angeles, California, in 1988. The band is a quartet composed of Eric Martin (lead vocals), Paul Gilbert (guitar), Billy Sheehan (bass guitar), and Pat Torpey (drums); The band is noted especially for their musicianship, and scored a number of hits. Their songs were often marked by strong vocals and vocal harmonies. Their hits include "To Be with You" (a number one single in 15 countries in 1992) and "Just Take My Heart".

Mr. Big have remained active and popular for over two decades, despite internal conflicts and changing music trends. They broke up in 2002, but after requests from fans, they reunited in 2009; their first tour was in Japan, in June 2009. To date, Mr. Big has released eight studio albums, the latest being ...The Stories We Could Tell (2014).

The band takes its name from the song by Free, which was eventually covered by the band on their 1993 album, Bump Ahead.