NGC 4633 is a spiral galaxy located about 70 million light-years away in the constellation of Coma Berenices. It is interacting with the nearby galaxy NGC 4634. NGC 4633 was discovered by astronomer Edward D. Swift on April 27, 1887. It was rediscovered on November 23, 1900, by astronomer Arnold Schwassmann and was later listed as IC 3688. NGC 4633 is a member of the Virgo Cluster.

400/500mm - 17.5" (5/22/93): fairly faint, fairly small, elongated 3:2 SW-NE, 1.2x0.8, no central concentration, halo fades into background. A mag 13 star is just off the NW edge of halo 0.8' from center. Forms a pair with NGC 4634 3.8' SSE.