Dolichocolon, also known as redundant colon or tortuous colon, is the congenital presence of an abnormally-long large intestine.‍ It should not be confused with an abnormally wide large intestine, which is called megacolon.^{[citation needed]} The name originates from Ancient Greek: δολιχός, romanized: dolĭkhós, lit. 'long, protracted', and "colon".

Dolichocolon may predispose to abnormal rotation of the colon (volvulus) and its interposition between the diaphragm and the liver (Chilaiditi syndrome). The exact cause remains unknown.‍ Dolichocolon is often an incidental finding on abdominal X-rays or in colonoscopy. It is not by itself a disease and as such requires no treatment if asymptomatic.