"Why You Treat Me So Bad" is a song by Jamaican-American reggae musician Shaggy featuring American rapper and emcee Grand Puba. It was released in 1995 as the second single from his third studio album, Boombastic (1995), and contains elements from "Mr. Brown" by Bob Marley. It was a notable hit in several countries, including Ireland, Italy, the Netherlands, New Zealand, and the UK, where it peaked at number 11.

Boombastic is the third studio album released by Jamaican artist Shaggy. The album was released on July 11, 1995.