The Williamsport Armory is an historic National Guard armory complex that is located at 1300 Penn Street in Williamsport, Pennsylvania.

It was added to the National Register of Historic Places in 1991.

The main armory building has a two-story, brick administration section that was designed in the Art Deco style, with an attached drill hall, taking a T-shaped plan.

It consists of a 1+1⁄2-story stable with an attached one-story gun shed.

[2] This complex was added to the National Register of Historic Places in 1991.