Titius may refer to:
1998 Titius, a main belt asteroid Titius (crater), a 2.7 km-deep lunar crater Titius (river), the Latin name for today's Krka river in Croatia The nomen borne by male members of the gens Titia
People with the surname Johann Daniel Titius (1729–1796), German astronomer Marcus Titius (1st century), Roman politician