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. (Original Gentleman)," which is a tribute to the legendary jazz drummer Elvin Jones.
This would be The Bad Plus' final album for Columbia Records, as the band and the label parted ways in 2006.