42 (Japanese: 第四十二號驅潜特務艇) was a No.1-class submarine chaser of the Imperial Japanese Navy that served during World War II.

She was laid down on 10 July 1942 and launched on 7 June 1943.

[2] On 27 August 1943, she was completed, commissioned, and assigned to the Sasebo Defense Force, Sasebo Naval District.

[2] On 20 February 1945, she was reassigned to the 21st Special Base Force, Surabaya, Java.

[2] On 23 June 1945, she was attacked and sunk by a torpedo from the American submarine USS Hardhead southeast of the Masalembu Islands at 05°44′S 114°16′E / 5.733°S 114.267°E / -5.733; 114.267.