The Cannonball House Maritime Museum is a maritime museum in Lewes, Delaware. It is owned and operated by the Lewes Historical Society.

The Cannonball House Maritime Museum features two distinctly different things. First, it preserves the historic Cannonball House, built in 1765, and is one of the few houses in town that still remains in its original location. It saw a lot of things all throughout its centuries of existence, including the residency of Gilbert McCracken and David Rowland who are both pilots for the Bay & River Delaware, the 1813 Bombardment of Lewes by the British, and the War if 1812 Park among other things. The other thing it is notable of is for being the current home of various nationally important pieces of maritime art and memorabilia.