Regiment Algoa Bay
Regiment Algoa Bay emblem
Active	1946
Allegiance	Republic of South Africa  South Africa
Branch	South African Army
Size	Battalion
Part of	South African Infantry Corps Army Conventional Reserve
Garrison/HQ	Port Elizabeth
Motto(s)	A Outrance
Battle honours

Regiment Algoa Bay was an infantry battalion of the South African Army. As a reserve force unit, it had a status roughly equivalent to that of a British Army Reserve or United States Army National Guard unit.

Regiment Algoa Bay^[1] was raised in January 1946 in Port Elizabeth. The Regiment was initially intended as an artillery unit to be known as the 5th Field Regiment. The Regiment therefore initially wore artillery badges.

By January 1960 however, the Regiment was renamed Regiment Algoa Bay and its role changed to that of mechanized infantry.^[2] The lighthouse cap badge was adopted in 1964 and was based on the design of the Donkin Reserve lighthouse.

During the latter part of 2000, Regiment Algoa Bay, Regiment Uitenhage and Donkin Regiment were amalgamated with Regiment Piet Retief. A new command team was appointed by a selection board that was convened by the Infantry Formation. Regiment Piet Retief was then also placed directly under command of the Infantry Formation.