| South Africa|
| 26 April – 7 September 1991|
The 1991 Currie Cup Central B was the third division of the Currie Cup competition, the premier domestic rugby union competition in South Africa. This was the 53rd season since the competition started in 1889.
The 1990 season was the last edition of the Currie Cup Division B. Instead, the second tier was changed to a Currie Cup Central Division, which had a four-team Division A and a four-team Division B.
Boland, Far North, Griqualand West, South Eastern Transvaal and Vaal Triangle moved from the 1990 Currie Cup Division B to the Central B Division.
Border were promoted from the 1990 Santam Bank Trophy to the Central B Division.
Eastern Transvaal were initially relegated from 1991 Currie Cup Central A to 1992 Currie Cup Central B. However, following the merger of all rugby governing bodies in South Africa, Western Province League were dissolved and Eastern Transvaal retained their place in Currie Cup Central A. Currie Cup Central B was reduced to five teams for 1992.
Border were promoted from the Central B to 1992 Currie Cup Central A.
1991 Currie Cup Central B Wikipedia
There were six participating teams in the 1991 Currie Cup Central B competition. These teams played each other twice over the course of the season, once at home and once away. Teams received two points for a win and one points for a draw. The winner of the Central B competition played off against the winner of the Central A competition for the Bankfin Cup.
In addition, all the Currie Cup Central B teams also played in the 1991 Currie Cup Central / Rural Series.
The winner of the Central B competition played off against the winner of the Central A competition for the Bankfin Cup.The Bankfin Cup was shared between Border and Western Transvaal.
As a result of the play-offs, Border were promoted to the 1992 Currie Cup Central A competition, while Eastern Transvaal were relegated to the 1992 Currie Cup Central B competition.