Ada Lovelace, in full Ada King, countess of Lovelace, original name Augusta Ada Byron, (born December 10, 1815, Piccadilly Terrace / died November 27, 1852, Marylebone, London), was an English mathematician, an associate of Charles Babbage, for whose prototype of a digital computer she created a program. She has been called the first computer programmer.

She was educated privately by tutors but was helped in her advanced studies by mathematician Augustus De Morgan, the first professor of mathematics at the University of London. On July 8, 1835, she married William King and became countess of Lovelace.