| South Africa|
| 5 May – 15 September 1990|
The 1989 Santam Bank Trophy was the third tier of domestic South African rugby, below the two Currie Cup divisions.
Divisions A and B merged into one nine-team division.
Boland, Far North and Western Province League were promoted to the Currie Cup Division B.
The 1990 season was the last edition of the Santam Bank Trophy. Instead, these teams were included in a Currie Cup Rural Division, which had a four-team Division C and a five-team Division D.
Border were promoted to the 1991 Currie Cup Central B.
Eastern Free State were relegated from 1990 Currie Cup Division B to the 1991 Currie Cup Rural C.
North Eastern Cape, Northern Natal and Stellaland moved to the 1991 Currie Cup Rural C.
Lowveld, North Western Cape, South African Rugby Association, South Western Districts and Winelands moved to the 1991 Currie Cup Rural D.
1990 Santam Bank Trophy Wikipedia
There were nine participating teams in the Santam Bank Trophy Division A. Teams played each other once over the course of the season, either at home or away. Teams received two points for a win and one points for a draw. The top two teams in the division qualified for the title play-off finals. The team that finished first would play at home against the team that finished second.
The final standings after the pool stage of the Santam Bank Trophy was as follows: