Ada may refer to:
Adam and Eve, according to the creation myth of the Abrahamic religions, were the first man and woman and the ancestors of all humans.
Augusta Ada King-Noel, Countess of Lovelace (née Byron; 10 December 1815 – 27 November 1852) was an English mathematician and writer, chiefly known for her work on Charles Babbage's proposed mechanical general-purpose computer, the Analytical Engine.
Adam Mitchel Lambert (born January 29, 1982) is an American singer, songwriter and stage actor. Since 2009, he has sold over 3 million albums and 5 million singles worldwide.
Adam Noah Levine (born March 18, 1979) is an American singer, songwriter, multi-instrumentalist, actor, and record producer.
Adam Warlock, originally known as Him, is a fictional character appearing in American comic books published by Marvel Comics.
Adam Smith FRSA (16 June 1723 NS (5 June 1723 OS) – 17 July 1790) was a Scottish economist, philosopher, and author.
In biology, an adaptation, also called an adaptive trait, is a trait with a current functional role in the life of an organism that is maintained and evolved by means of natural selection.
Adam Bernard "Pacman" Jones (born September 30, 1983) is an American football cornerback and return specialist for the Cincinnati Bengals of the National Football League (NFL).