Seaham was a parliamentary constituency, in existence between 1918 and 1950, of the House of Commons of the Parliament of the United Kingdom. It elected one Member of Parliament (MP) by the first past the post system of election.

Seaham is a seaside town in County Durham, England. Located on the Durham Coast, Seaham is situated 6 miles south of Sunderland and 13 miles (21 km) east of Durham. The town grew from the late 19th century onwards as a result of investments in its harbour and coal mines. The town is twinned with the German town of Gerlingen.