Rainwater usually refers to the water from rain.

Rainwater may also refer to:

• Rainwater Basin, a loess plain in south-central Nebraska
• Rainwater Creek, a tributary stream of Lake Fork Creek in Northeast Texas
• Rainwater Observatory and Planetarium, located in French Camp, Mississippi
• The Rainwater LP, 2010 album by Citizen Cope
• Rain water, literal meaning of Yushui, a Chinese solar term

• Edwin R. Rainwater (1813–1850), a soldier in the Texas Army during the Texas Revolution
• Gregg Rainwater (born 1966), American actor
• James Rainwater (1917–1986), American physicist
• Jody Rainwater (1920–2011), American bluegrass musician and radio personality
• John Rainwater (created 1952), fictional mathematician and author of functional analysis papers
• Lee Rainwater (1928–2015), American sociologist and professor of sociology at Harvard University
• Manford W. Rainwater (1913–1997), American politician
• Marvin Rainwater (1925–2013), American country and rockabilly singer and songwriter
• Paul Rainwater, Louisiana government official
• Richard Rainwater (1944–2015), American investor and philanthropist
• Rotimi Rainwater (born 1970), American writer, director, and producer