[10] Former Connacht centre Seán O'Brien joined the province from English club Exeter Chiefs.
[14] Lock Paddy Kelly and prop Liam O'Connor were forced to retire upon the conclusion of the previous season due to respective brain and neck injuries, centre Oli Morris and academy back-three Conor Phillips were released by the province,[15] and lock Eoin O'Connor joined English club Exeter Chiefs[16] Club legend Keith Earls, who was contracted until the end of the 2023 Rugby World Cup, confirmed his retirement upon Ireland's exit from the tournament, bringing to an end his 16-year Munster career.
[19] In a world first, Munster will host Super Rugby champions the Crusaders in a so-called Clash of Champions on 3 February 2024, a match that will see former Munster head coach Rob Penney return to the province after he was appointed as Crusaders new head coach ahead of 2024.
[20] Greig Oliver, an elite player development officer with Munster's academy since 2011, died in a paragliding accident in Cape Town, South Africa, on 3 July 2023, where he and his wife were following their son Jack, who is in Munster's academy, with the Ireland under-20s team at the 2023 World Rugby U20 Championship.
[25] Below are the players who joined and left the Munster senior and academy squads ahead of the 2023–24 season.
Senior squad Academy squad Props Hookers Locks Back row Scrum-halves Fly-halves Centres Back three Props Hookers Locks Back row Scrum-halves Fly-halves Centres Back three Pink background indicates teams that are in play-off places and earn a place in the 2024–25 European Challenge Cup Yellow background indicates the team that won the 2023–24 European Challenge Cup and thus qualify for the 2024–25 European Champions Cup, but are not in a play-off place Plain background indicates teams that earn a place in the 2024–25 European Challenge Cup.