Simon Jonathon Gallup (born 1 June 1960) is an English musician and bassist of the post-punk band The Cure. Gallup joined the band in 1979 alongside keyboardist Matthieu Hartley, with whom he was a member of the Magazine Spies, shortly after the release of the Cure’s debut album, Three Imaginary Boys.

Behind singer Robert Smith, Gallup is the second-most consistent member of the Cure, appearing on every album besides Three Imaginary Boys and The Top; the latter he missed due to his brief departure from the band after a ferocious falling-out with Smith after a concert.

In 2019, Smith shared:

For me, the heart of the live band has always been Simon, and he’s always been my best friend. It’s weird that over the years and the decades he’s often been overlooked. He doesn’t do interviews, he isn’t really out there and he doesn’t play the role of a foil to me in public, and yet he’s absolutely vital to what we do. We’ve had some difficult periods over the years but we’ve managed to maintain a very strong friendship that grew out of that shared experience from when we were teens. When you have friends like that, particularly for that long, it would take something really extraordinary for that friendship to break. You’ve done so much together, you’ve so much shared experience, you just don’t want to lose friends like that.