The 1990–91 NSL Cup was the fifteenth season of the NSL Cup, which was the main national association football knockout cup competition in Australia. 14 teams from around Australia entered the competition.
South Melbourne Hellas v West Adelaide Hellas
Melbourne Knights v Sunshine George Cross
Adelaide City v St George SC
Marconi Stallions v Sydney United 58
Sydney Olympic v APIA Leichhardt
Wollongong Wolves v Wollongong United
South Melbourne Hellas v Sunshine George Cross
Parramatta FC v Adelaide City
Marconi Stallions v Preston Lions
APIA Leichhardt Tigers v Wollongong Wolves
