Konstantinos Kallias (July 9, 1901 – April 7, 2004) was a Greek politician.
He was born in Chalkis.
He co-founded with Panagiotis Kanellopoulos the National Unionist Party.
He served in many ministerial positions, including Minister for Justice (1958) and vice-president of New Democracy under Konstantinos Karamanlis (1975–1976).
In the first Greek elections to the European Parliament, he was elected as a Member of the European Parliament (MEP).
In 2003 he entered the Guinness Book of Records as the oldest active writer of an autobiography, at the age of 102.