Robert Sandeman was a Scottish nonconformist theologian. He was closely associated with the Glasite church which he helped to promote. His importance was such that Glasite churches outside Scotland were known as Sandemanian.

The Glasites or Glassites were a small Christian church founded in about 1730 in Scotland by John Glas. Glas's faith, as part of the First Great Awakening, was spread by his son-in-law Robert Sandeman into England and America, where the members were called Sandemanians.