George Plater III (November 8, 1735 – February 10, 1792) was an American planter, lawyer, and statesman from Saint Mary's County, Maryland.

George Plater III was born at Sotterley, the family plantation near Leonards Town in the Province of Maryland.

[1] His father, George II, had married Rebecca Addison Bowles, the widow of the plantation's founder, in 1729.

[5] After receiving his early schooling at home, he attended the College of William and Mary in Williamsburg, Virginia, graduating in 1752.

Plater was an active Protestant who served twenty-eight years as a vestryman of St. Andrew's Episcopal Church (which he helped to found and build).

John Rousby Plater (born 10/15/1767 at Annapolis, Anne Arundel, Maryland) married Elizabeth Tuttle and was a lawyer and judge.

When Plater died on February 10, 1792, in the capital city of Annapolis, Maryland, his body was returned home and buried at Sotterley, on the banks of the Patuxent River in St. Mary's County.