do freemasons believe the earth is flat?

Freemasonry does not teach that the Earth is flat. While ancient civilizations believed the Earth was flat and held it to be supported by pillars 1, Masonic symbolism explicitly incorporates terrestrial and celestial globes 2.

In the Craft, particularly within the Fellowcraft degree, globes depicting the Earth and the heavens are prominently featured atop pillars or displayed as lodge furnishings 12. Speculative Masons utilized these terrestrial globes as maps of the world to symbolize the global expanse and universality of the Fraternity 2. Rather than endorsing ancient cosmological theories of a flat Earth, the adoption of physical globes in lodge displays during the eighteenth century served as a visual reminder of Masonry's expansion across all nations, religions, and races 2.