The 2019–20 season is the 16th season in the history of the Scarlets, a Welsh regional rugby union side based in Llanelli, Carmarthenshire. In this season, they will compete in the Pro14 and, after failing to qualify for the Champions Cup for the first time in their history, the Challenge Cup. It will be the team's first season under head coach Brad Mooar, who will be assisted by defence coach Glenn Delaney and assistant attack coach Richard Whiffin, after Wayne Pivac departed to take charge of the Wales national team.