The 2019–20 PRO14 (also known as the Guinness PRO14 for sponsorship reasons) was the nineteenth season of the professional rugby union competition originally known as the Celtic League.

It was the third season to be referred to as the PRO14 (the competition was named the Pro12 immediately prior to the addition of two South African teams).

[6] To ensure a competitive balance, the teams are distributed approximately evenly between the conferences based upon their performance in the previous season.

[10] The Southern Kings announced in August 2020 that they had voluntarily withdrawn from the league for the remainder of 2020 and therefore there will not be South African derbies.

[14] Leinster's highest profile departure in the off-season was Seán O'Brien, who made over 100 appearances and was the side's former vice-captain.

[23] With Henderson unavailable in the opening rounds due to the World Cup,[16] the side was captained by Rob Herring.

[29] Dragons announced the departure of head coach Bernard Jackman in December 2018, with Ceri Jones replacing Jackman on an interim basis for the remainder of the 2018–19 season, before the region confirmed in May 2019 that Dean Ryan would join in the newly created director of rugby position.

The 2019–20 Pro14 Dream Team is:[34] The 2019–20 Pro14 season award winners are:[35] Note: Flags to the left of player names indicate national team as has been defined under World Rugby eligibility rules, or primary nationality for players who have not yet earned international senior caps.