John Beale Bordley, (February 11, 1727 Annapolis, Maryland – January 26, 1804 Philadelphia) was a Maryland planter and judge.
He was the son of Thomas Bordley, from Yorkshire, England 1694, attorney general for Maryland, and his second wife Ariana Vanderheyden.
He was educated at the library of his step brother, Stephan Hadley, At the age to ten, he went to live with his uncle in Chestertown. He received his early education under the direction of the Chestertown Free School teacher, Charles Peale.
He married Margaret Chew, (June 29, 1735 – November 11, 1773), in 1750, and went to live at Joppa, Maryland, then in the "wilderness" of Baltimore County. For the next 12 or 13 years he worked his plantation, and held the county clerkship. In 1768, he was one of the commissioners to help determine the boundary between Maryland and Delaware. On September 25, 1770, he was present at the Upper House of Assembly of Maryland. Later he moved to Baltimore City, where he was appointed a judge of the Provincial Court, and judge of the British Admiralty Court. He served as a member of Governor Horatio Sharpe's and Governor Sir Robert Eden, 1st Baronet, of Maryland's Councils.
In 1770, his wife inherited from the Chew family half of Wye Island, in Queen Anne's County, on the Chesapeake Bay, (the other half going to his sister-in-law, Mary, wife of William Paca). The Bordleys maintained their winter residence in Annapolis, they moved to his beautiful estate on Wye Island. They had four children: Thomas Bordley (born 1755- 1771), Matthias Bordley (born 1757–1818), Henrietta Maria Bordley (born 1762), John Beale Bordley, Jr. (born 1764–1815)
After Margaret died, in 1777, he married Mrs. John Mifflin (Sarah Fishbourne) (October 20, 1733 – May 16, 1816), a widow of Philadelphia. (He became stepfather to Thomas Mifflin.) Then the Bordley family wintered in Philadelphia, and a large farm in Chester County, Pennsylvania, “Como Farm". He soon became a member of the American Philosophical Society. They had the daughter Elizabeth Bordley (1777–1863).