Thomas Peter Thorvald Kristian Ferdinand Mortensen (August 16, 1882 – April 25, 1998), known as an adult as Christian Mortensen, was a Danish supercentenarian. When he died at the age of 115 years and 252 days, Mortensen was the oldest man who has ever lived whose age was undisputed. (The Guinness Book of World Records ranks him second to the Shigechiyo Izumi, whose age is now disputed, with a note in recent editions that the latter’s age was uncertain). Mortensen was the first undisputed recorded man to reach age 114.
Mortensen was baptized in Fruering Church on December 26, 1882. Besides his baptismal record, other records include the 1890 and 1901 census enumerations in Denmark, and church confirmation in 1896.