The Hario (針尾) was a Japanese fleet oiler, serving during World War II. Four vessels were planned under the Maru Sen Programme; however, only one vessel was completed by the end of war.

The Hario-class oilers were planned instead of the cancelled Kazahaya class oilers. The Navy Technical Department (Kampon) armed these vessels as a Type 1TL wartime standard ship.

The Hario was completed and assigned to the Combined Fleet on 1 December 1944, joining the Hi-89 convoy from Moji to Singapore on 24 January 1945. She arrived in Singapore on 9 February 1945, joining the Hi-94 convoy (returning to Moji from Singapore) on 23 February 1945. On 1 March, she arrived at a relay point at Yulin, Hainan. Two days later, on 3 March, she left Yulin, only to hit a mine and sink the same day. She was decommissioned 10 May.

Ship #	Ship	Builder	Laid down	Launched	Completed	Fate
4901	Hario (針尾)	Harima Zōsen Corporation	2 June 1944	4 October 1944	1 December 1944	Struck a naval mine at Yulin and sank on 3 March 1945.
4902	Inatori (稲取)					Cancelled in 1945.
4903	Karasaki (韓崎)
4904	Tatsumai (龍舞)

• Ships of the World special issue Vol.47, Auxiliary Vessels of the Imperial Japanese Navy, "Kaijinsha"., (Japan), March 1997
• Shinshichirō Komamiya, The Wartime Convoy Histories, "Shuppan Kyōdōsha". Archived from the original on 2011-07-22. Retrieved 2009-05-23., (Japan), October 1987, ISBN 4-87970-047-9

18°10′N 109°40′E / 18.167°N 109.667°E / 18.167; 109.667