Hythe is a market town and civil parish on the edge of Romney Marsh in Kent, England. Hythe is an Old English word meaning haven or landiā¦Hythe is a market town and civil parish on the edge of Romney Marsh in Kent, England. Hythe is an Old English word meaning haven or landing place. The town has mediaeval and Georgian buildings, as well as a Saxon/Norman church on the hill and a Victorian seafront promenade. Hythe was once defended by two castles, Saltwood and Lympne. Hythe Town Hall, a neoclassical style building, was completed in 1794.