No.1-class may refer to:No.1-class auxiliary minelayer, built 1941 – 1942 No.1-class auxiliary minesweeper, built 1941 – 1943 No.1-class auxiliary submarine chaser, built c. 1942 – 1945 No.1-class escort ship, built 1943 – 1946 No.1-class landing ship, built 1943 – 1945 No.1-class minesweeper, built 1922 – 1929 No.1-class patrol boat, built 1940 No.1-class submarine chaser, built 1933 – 1936