Suspicious Activity? is the fourth studio album by the American jazz band The Bad Plus. The band had previously garnered attention for covering well-known rock songs in an "acoustic power trio" style, but Suspicious Activity? includes only one cover version: the theme to the 1981 movie Chariots of Fire. Instead, the album focuses on the band's original music, including the track "O.G. ," which is a tribute to the legendary jazz drummer Elvin Jones.

The Bad Plus is an American jazz quartet, formerly a trio, from Minneapolis, Minnesota, United States, consisting of founding bassist Reid Anderson and drummer David King, as well as guitarist Ben Monder and tenor saxophonist Chris Speed.