Lydia is a character in the Mario series that is the second Portrait Ghost Luigi encounters in Luigi's Mansion and she can be found in the Master Bedroom. She is the wife of Neville and the mother of Chauncey, Henry and Orville.

In order to defeat Lydia, Luigi must use his Poltergust 3000 to open the curtains for wind to blow into the Master Bedroom which will make Luigi have his chance to catch Lydia. She is revealed to have 100 HP. After Luigi defeats her, he will gain the key to the Nursery room.