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). On 12 March 2020, the season was suspended due to the COVID-19 pandemic. It restarted on 22 August in a truncated format. It was won by Leinster, their third consecutive Pro14 title.