A Master Mason is the designation of a Freemason who has completed the Third Degree in Masonic Lodge (aka Blue Lodge or Craft Masonry).

The Three Degrees, in order, are:

1. Entered Apprentice
2. Fellowcraft
3. Master Mason

Although higher numbered degrees exist in related organizations such as Scottish Rite, the Master Mason is considered the highest degree in Freemasonry.

See also: Freemason, York Rite, Scottish Rite, and Shriners