| Pro14 Rainbow Cup | |
|---|---|
 | |
| Countries |  Ireland Italy Scotland Wales South Africa |
| Date | 23 April 2021 – 19 June 2021 |
| Champions | Benetton |
| Runners-up | Bulls |
| Matches played | 40 |
| Official website | |
| www | |
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The Pro14 Rainbow Cup (also known as the Guinness Pro14 Rainbow Cup for sponsorship reasons) was a professional rugby union end-of-season cup competition played in 2021 that consisted of two separate tournaments: the Rainbow Cup for twelve European clubs and the Rainbow Cup SA for four South African clubs. The winners of each competition then played a final match to determine the overall winner. The tournament operated as a shortened 'Spring season' to allow for the integration of the four new South African teams into the United Rugby Championship ahead of the 2021–22 season.
In winning the play-off final against the Bulls of South Africa, Benetton Treviso became the first Italian side ever to win any of the successor championships to the Celtic League.