List of Sydney United 58 FC seasons

Sydney United 58 Football Club is a semi-professional association football club based in Edensor Park, a suburb of Sydney, New South Wales, Australia. The club was founded in Surry Hills as Sydney Croatia Sports Club in 1958 by Croatian Australians. Sydney Croatia first competed in the third division of the NSW Soccer Football Association in 1959 and earned promotion to the first division in 1962. The club claimed their first state league title in 1977 and won it a further four times in 1978, 1979, 1981 and 1982. Around this time, Croatia played at several grounds, namely Wentworth Park, ES Marks Athletics Field, Sydney Sports Ground and Parramatta Stadium before building Sydney United Sports Centre in 1980, located in Edensor Park.

The club played their first season in the National Soccer League in 1984, after years of being rejected by the association for having a non-nationalistic name. After two Finals series appearances in 1985 and 1986, Sydney Croatia reached their first national final in the 1987 NSL Cup, in which the club won, and first league Grand Final in 1988. The club was renamed to Sydney United in 1993 and would appear in two more Grand Finals in 1997 and 1999, with two premier titles in the 1996–97 and 1998–99 season. This would mark the end of the golden generation for Sydney United, followed by the demise of the NSL in the 2003–04 season. During their time in the NSL, United produced 48 players who went on to play for the Australian national team.

Sydney United played in the National Premier Leagues NSW in the 2004–05 season where they faced a fierce rivalry with Bonnyrigg White Eagles, which resulted in riots between the club's supporters when the two clubs played each other. Despite this, until 2020, Sydney United have claimed two league championships, two league premiers titles, and three Waratah Cup during their time in NPL. The club claimed two Grand Finals of the National Premier Leagues, winning the inaugural final in 2013 and a second final in 2016. In 2022, Sydney United became the first state league club to play in an Australia Cup final after defeating A-League Men clubs Western United and Brisbane Roar. United would lose the final to Macarthur FC and was sanctioned for the match due to fascist behaviour from the club's supporters.

Key
Key to league:
 * Pos. = Final position
 * Pld = Matches played
 * W = Matches won
 * D = Matches drawn
 * L = Matches lost
 * GF = Goals for
 * GA = Goals against
 * Pts = Points

Key to rounds:
 * C = Champions
 * F = Final (Runners-up)
 * PF = Preliminary finals
 * SF = Semi-finals
 * EF = Elimination finals
 * QF = Quarter-finals
 * R32/R16 = Round of 32, round of 16, etc.
 * R1/R2 = First round, second round, etc.
 * GS = Group stage
 * DNQ = Did not qualify

Top scorers shown in italics with number of goals scored in bold  are players who were also top scorers in the league that season.