Robert Dormer, 1st Baron Dormer (26 January 1551 – 8 November 1616) was a 17th-century English peer.
Dormer was the son of Sir William Dormer and his second wife, Dorothy (née Catesby).
He served as High Sheriff of Buckinghamshire in 1584 and was knighted in 1591. He was returned as Member of Parliament for Tregony in 1571 and for Buckinghamshire in 1593.
In June 1615 he was created a baronet, of Wing (or Wyng or Wemme). Only a few weeks later he was raised to the peerage as Baron Dormer, of Wenge in the County of Buckingham. He married the Hon. Elizabeth, daughter of Anthony Browne, 1st Viscount Montagu, in circa 1590.
Lord Dormer died in November 1616, aged 65, and was succeeded in his titles by his grandson Robert, who was created Earl of Carnarvon in 1628.