The were a class of three oilers of the Imperial Japanese Navy (IJN), serving during the 1920s and World War II.
The Ondo class was initially planned in 1920 as the six of the Kamoi-class oilers under the Eight-eight fleet final plan. However, of the Kamoi-class oilers, only the Kamoi was completed, due to the conclusion and signing of the Washington Naval Treaty. The other five vessels were then re-planned to the Modified Notoro class.
Out of the five ships, one became the icebreaker, while the other become the food supply ship . Therefore, only three ships were built as Modified Notoro-class (Ondo-class) oilers.
They devoted themselves to importing crude oil from North America and Southeast Asia. The crude oil which the Ondo class and the carried to Japan was 388 sorties; 3,000,000 tons, until 1941.
They were not able to accompany the fleet, because they had low speed. They were engaged in supply duties at naval bases.
| Ship | Builder | Laid down | Launched | Completed | Fate |
| Kawasaki-Kōbe Shipyard | 15-03-1922 | 21-10-1922 | 12-03-1923 | Sunk by air raid at Manila Bay 13-11-1944. | |
| Kure Naval Arsenal | 14-03-1922 | 04-12-1922 | 18-05-1924 | Scuttled off Singapore, 1946. Decommissioned on 03-05-1947. | |
| Yokosuka Naval Arsenal | 11-04-1922 | 30-01-1923 | 30-10-1924 | Heavy damaged by air raid at Rabaul, 14-01-1944 and grounded. Damaged once again 02-03-1944. Scuttled 15-03-1944. | |
| 2 vessels | Re-planned as an icebreaker and food supply ship. | ||||
八八艦隊案 (ja)