"Bad Girls" is a song by American singer Donna Summer from her 1979 seventh studio album of the same name, released as the second single from the Bad Girls album on June 23, 1979, through Casablanca Records. The song was produced by Summer's regular collaborators Giorgio Moroder and Pete Bellotte, and co-written by Summer and the Brooklyn Dreams.
"Bad Girls" became a worldwide success, peaking within the top-ten in seven countries, including Spain and New Zealand. In the United States, it spent five weeks at number-one on the Billboard Hot 100 and sold over two million copies, simultaneously becoming, alongside "Hot Stuff", her most successful single. The single, which was the second-biggest song of 1979, also helped the Bad Girls album to reach the multi-platinum status in the US. Summer placed three songs in the Top 12 of the Billboard 1979 year-end charts. And Now Cheryl Chase, Kevin Michael Richardson, Billy West, and Tim Curry covered the song in 2000 for Rugrats in Paris: The Movie.