The Roscommon County Museum is a museum dedicated to the history of County Roscommon, and is run by the County Roscommon Historical and Archaeological Society.

It is housed in a former Presbyterian Church built in 1863. The museum displays items of local historic interest that has been donated or loaned to the museum by the public of County Roscommon.

Historical exhibits include a 9th century grave stone/marker written in Irish, Old Gaol gate (1730s) and a Sheela-na-Gig.