| Tourney Name: | NSWRFL Midweek Cup |
| Year: | 1983 |
| Other Titles: | NSWRFL KB Cup |
| Dates: | 13 April - 10 August 1983 |
| Num Teams: | 18 |
| Venues: | 3 |
| Cities: | 3 |
| Champion Other: | Manly-Warringah |
| Count: | 2 |
| Second Other: | Cronulla-Sutherland |
| Matches: | 17 |
| Prevseason: | 1982 |
| Nextseason: | 1984 |
The 1983 KB Cup was the 10th edition of the NSWRFL Midweek Cup, a NSWRFL-organised national club Rugby League tournament between the leading clubs and representative teams from the NSWRFL, the BRL, the CRL, the QRL and the NZRL.
A total of 18 teams from across Australia and New Zealand played 17 matches in a straight knock-out format, with the matches being held midweek during the premiership season.
| Sydney | Brisbane | Newcastle | |
|---|---|---|---|
| Leichhardt Oval | Lang Park | Newcastle International Sports Centre | |
| Capacity: 23,000 | Capacity: 45,000 | Capacity: 33,000 | |
| Date | Winner | Score | Loser | Score | Venue | Man of the Match |
|---|---|---|---|---|---|---|
| 13/04/83 | Manly-Warringah (Ribot try, P.Blake field goal) | 5 | 0 | |||
| 20/04/83 | Canberra (O'Callaghan 2, Keir, Spears tries, Giteau 3 goals) | 22 | Balmain (Lane 2, Lawson tries, Filipaina 4 goals) | 20 | ||
| Date | Winner | Score | Loser | Score | Venue | Man of the Match |
|---|---|---|---|---|---|---|
| 27/04/83 | Canterbury-Bankstown (Leis, Conlon tries, Conlon 3 goals) | 14 | Penrith (Martin, Izzard tries, Marshall goal) | 10 | Garry Hughes - Canterbury-Bankstown | |
| 11/05/83 | Newtown (Doyle 5, Sigsworth, Wilson, Ellis, Bird tries, Wilson 7 goals) | 50 | Central Districts (NZ) | 0 | Chris Doyle - Newtown | |
| 18/05/83 | 38 | 18 | Wally Lewis - Combined Brisbane | |||
| 18/05/83 | 78 | 4 | Ian Schubert - Manly-Warringah | |||
| 25/05/83 | 20 | 12 | Ross Gibson - NSW Country | |||
| 1/06/83 | Cronulla-Sutherland (Beckett 2, Gardner, Withall tries, D.Sorensen 4 goals) | 24 | St George (Rogers try, Gearin 2 goals) | 8 | Rowland Beckett - Cronulla-Sutherland | |
| 8/06/83 | Eastern Suburbs (Michael, Grounds 2, Walford, Eden tries, Eden 4 goals) | 32 | Canberra (Wurth 2, Spears tries, Giteau 2 goals) | 16 | Mike Eden - Eastern Suburbs | |
| 15/06/83 | Western Suburbs (Harris, Greene tries, Greene goal) | 10 | Illawarra (McKellar try) | 4 | David Greene - Western Suburbs | |
| Date | Winner | Score | Loser | Score | Venue | Man of the Match |
|---|---|---|---|---|---|---|
| 22/06/83 | Eastern Suburbs (Eden 3, Walford 2 tries, Eden 5 goals) | 30 | Newtown (Speechley try, Wilson 4 goals) | 12 | Kevin Hastings - Eastern Suburbs | |
| 29/06/83 | Cronulla-Sutherland (Nixon 2, Mullane, O'Connor, D.Sorensen, Lane tries, Hardy 5 goals) | 34 | Western Suburbs (S.Gale, T.Lamb tries, Greene 2 goals) | 12 | Scott Gale - Western Suburbs | |
| 13/07/83 | Manly-Warringah (Sigsworth, Walker tries, Sigsworth goal) | 10 | Canterbury-Bankstown (Conlon 2 goals, C.Mortimer field goal) | 5 | Alan Thompson - Manly-Warringah | |
| 20/07/83 | Combined Brisbane (Brennan 3, Lindenberg 2, Meninga, Paterson, Miles, Tessman tries, Meninga 6, Lewis 3 goals) | 54 | NSW Country (McCartney, Kearney tries, Elwin 3 goals) | 14 | Gene Miles - Combined Brisbane | |
| Date | Winner | Score | Loser | Score | Venue | Man of the Match |
|---|---|---|---|---|---|---|
| 27/07/83 | Manly-Warringah (P.Blake 2, Close, Windshuttle tries, Eadie 3 goals, P.Blake field goal) | 23 | Combined Brisbane (Brennan, Jones tries, Meninga 3 goals) | 14 | Graham Eadie - Manly-Warringah | |
| 3/08/83 | Cronulla-Sutherland (Gardner 2, Anderson tries) | 12 | Eastern Suburbs (Neil try, Eden 3 goals) | 10 | Greg Nixon - Cronulla-Sutherland | |