Sabotage at Sea is a 1942 British, black-and-white, drama, mystery, war film, directed by Leslie S. Hiscott and starring Jane Carr, Margaretta Scott, David Hutcheson and Ronald Shiner as Ernie the Cook. It was produced by British National Films and Shaftesbury Films.

It has the overall format of a whodunnit but with a clear theme of protecting military secrets during the Second World War.