Assail Bank is a bank in South Passage of the Houtman Abrolhos, in the Indian Ocean off the coast of Western Australia.

It is nominally located at 28°20′45″S 113°41′3″E﻿ / ﻿28.34583°S 113.68417°E﻿ / -28.34583; 113.68417Coordinates: 28°20′45″S 113°41′3″E﻿ / ﻿28.34583°S 113.68417°E﻿ / -28.34583; 113.68417.