Lydia may refer to:

• Lydia, an ancient kingdom in western Anatolia, inhabited by the Lydians who spoke the Lydian language.

• Lydia (band), an indie rock band.

• 110 Lydia, a large asteroid in the asteroid belt.

• "Lydia the Tattooed Lady", a song by Groucho Marx.

• Lydia of Thyatira, a deacon in the New Testament of the Bible and the first convert to Christianity in Europe.