1999–2000 Cardiff City F.C. season

's 73rd season in the Football League.

They competed in the 24-team Division Two, then the third tier of English football, finishing twenty-first, suffering relegation to Division Three.

During the season manager Frank Burrows parted company with the club, being replaced by Billy Ayre.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Players may hold more than one non-FIFA nationality.