McAllister Pender Lonnon (20 April 1916 – 28 January 1999) was an English rower who competed at the 1936 Summer Olympics.

Lonnon was educated at Westminster School^[1] and Cambridge University. In 1935 and 1936 he was a member of the winning Cambridge boat in the Boat Race. Later in the year he was a member of the crew of the eight which came fourth representing Great Britain at the 1936 Summer Olympics in Berlin.^[2] He again rowed for Cambridge in the Boat Race in 1937.