The 2019 O'Byrne Cup was played by county teams of Leinster GAA in December 2018 and January 2019. The draw took place on 26 September 2018. Several new rules are being trialled in the competition: * four consecutive handpasses were forbidden * the "advanced mark" was introduced * sideline kicks must go forward (unless inside the attacking 20-metre line) * all kickouts are from the 20-metre line * a "sin bin" for a black card offence. It was won by Westmeath.