Nicholas David Barratt (born 16 May 1970) is an English genealogist. He is best known as genealogical consultant for series 1 to 4 of the BBC show Who Do You Think You Are?. Barratt is also the CEO of Sticks Research Agency and personal heritage site Nations Memory Bank. He also presents Live the Dream: As Seen on TV with Melissa Porter.
Barratt has made numerous TV appearances, and his credits include House Detectives, Invasion, Omnibus and the BAFTA-nominated Seven Wonders of the Industrial World. Since 2002, he has moved into presenting, History Mysteries, Hidden House History and So You Think You’re Royal on television, and Tracing Your Roots for Radio 4. He also presented the research strands for BBC's Who Do You Think You Are? DVD.