List of Cardiff Rugby seasons

This article lists the seasons played by Cardiff Rugby from 2003, when they formed. The list details the club's achievements in senior league and cup competitions, and the top scorers for each season.

Key
Key to league record:
 * P = Played
 * W = Games won
 * D = Games drawn
 * L = Games lost
 * F = Points for
 * A = Points against
 * Pts = Points
 * Pos = Final position

Key to rounds:
 * QR = Qualifying round
 * Group = Group Stages
 * QF = Quarter-finals
 * SF = Semi-finals
 * RU = Runners-up
 * W = Winners