Mason Dixon may refer to:

• Mason-Dixon Line separating Delaware and Pennsylvania from Maryland, surveyed 1763--1767
  • Charles Mason and Jeremiah Dixon, royal surveyors who developed the line
• Mason & Dixon, the 1997 novel by Thomas Pynchon featuring the surveyors as characters
• Mason-Dixon Polling & Research Inc., an independent polling firm
• Mason Dixon (artist), AKA Jameson Wallace, AKA Michael Crampton, Chicago academic and performer
• Mason Dixon (band), a country music band from the 1980s
• The opponent of the title character in Rocky Balboa

[ Source: Wikipedia ]