The Dinker-Irvin House is a historic house at 310 Garfield Parkway Extended in Bethany Beach, Delaware. Built in 1904 by William Dinkin, it is one of the oldest early 20th-century summer cottages in the community. Between 1922 and 1925 it served as the community post office, and is the only public-use building from that era to survive. It has twice been moved, once over a property dispute, and in 2007 due to road works. The house has been acquired by the city, with plans to convert it into a museum. The house was added to the National Register of Historic Places in 2017.