Luigi's Mansion 3 is an action-adventure game developed by Next Level Games and published by Nintendo for the Nintendo Switch. It is the third entry in the Luigi's Mansion series following Luigi's Mansion: Dark Moon, released on October 31, 2019. The game sees players taking on the role of Luigi who must explore a haunted hotel, incorporating different themes on each floor, and rescue his friends from the ghosts that inhabit it, after the group is tricked into visiting it for a vacation by an old foe.

Alongside a number of returning gameplay elements from the previous installments, the game incorporates new features, including additional moves for ghost catching, an ectoplasmic doppelgänger assistant known as Gooigi, and expanded multiplayer functionality that allows for players to engage in cooperative and competitive gaming both locally and online. The game received critical acclaim from critics and was nominated for several awards, even winning the award for "Best Family Game" at The Game Awards 2019. As of September, 2020, the game sold over seven million copies worldwide.