The Ismay Jail is a National Registered Historic Place located in Ismay, Montana.

It was added to the Register on June 4, 1997.

It is a small jail which was built in 1909.

It is built of red brick on a concrete slab, and it has a barrel form concrete roof.

It has one 26 by 18 inches (0.66 m × 0.46 m) window on each of its west and north sides.