River Patrol is a 1948 British second feature ('B') crime film directed by Ben R. Hart and starring John Blythe, Lorna Dean, and Wally Patch. The screenplay was by James Corbett and concerns a group of undercover British customs officers who investigate a gang of nylons smugglers. It was made by Hammer Film Productions at Marylebone Studios in London. It is notable for being one of the earliest films made by Hammer following its relaunch after the Second World War.