Aunu‘u Small Boat Harbor (SBH) is located on the western shoreline of Aunu‘u Island, American Samoa. Aunu‘u SBH was authorized under Section 107 of the River and Harbor Act of 1960, as amended. The non-Federal sponsor is the Department of Port Administration, American Samoa Government. The project is in the operations and maintenance phase.

Aunu‘u SBH was constructed by the U.S. Army Corps of Engineers in March 1981. The total project cost was $1,938,294 (Federal: $1,713,446; non-Federal: $224,848). The completed project consists of a northern revetted mole that is 240 feet long; a southern revetted mole that is 220 feet long; a stub breakwater that is 90 feet long; an access channel that is 175 feet long, 70 feet wide, and 14 feet deep; a turning area 14 feet deep; a mooring area 8 feet deep; a wave absorber that is 200 feet long; and a service dock (constructed as a local feature).

The Aunu‘u SBH provides navigation safety to boats ferrying people and goods between the small Aunu‘u community and the main island of Tutuila.

The U.S. Army Corps of Engineers is responsible for maintaining the project structures and project depths in the entrance channel and turning basin area. In 1994 repair work at Aunu‘u SBH consisted of repairing the south revetted mole, the stub breakwater, and the north revetted mole, utilizing 4.5 ton tribars to repair the armor layer section of each structure.