4, also known as Foreigner 4, is the fourth studio album by the British-American rock band Foreigner, released on July 3, 1981, on Atlantic Records. Several singles from the album were hits, including "Urgent", "Waiting for a Girl Like You" and "Juke Box Hero".

The album name represented the band's fourth studio album and also the band's reduction from six to four members. Musically, it showed Foreigner shifting from hard rock to more accessible mainstream rock and pop music.

The album was a success worldwide, holding the #1 position on the Billboard album chart for a total of 10 weeks. It eventually sold over six million copies in the US alone.