Sir John Lexington (or Lexinton or Lessington; also de Lexington) (died 1257) was a baron and royal official in 13th century England. He has been described as having been Lord Chancellor, but other scholars believe he merely held the royal seals while the office was vacant or the chancellor was abroad. He served two terms, once from 1247 to 1248, and again from 1249 to 1250.[1]