"I Get Weak" is a song by American singer Belinda Carlisle from her second studio album, Heaven on Earth (1987).

Written by Diane Warren and produced by Rick Nowels, the song was released as the second single from Heaven on Earth on January 1, 1988.

After completing the song, songwriter Diane Warren "initially had Stevie Nicks in mind – a suggestion she made to producer Rick Nowels, who felt it would be a better fit for Carlisle.

"[1] Jerry Smith of Music Week called "I Get Weak" a "smooth and rather sanitised track" which "will need plenty of support if it's to make much impression".

[2] The accompanying music video for the song features a combination of color and black-and-white shots in the same frames.