Nicholas David Barratt (born 16 May 1970) is an English genealogist and Director of Senate House Library at the University of London. He is best known as genealogical consultant for series 1 to 4 of the BBC show Who Do You Think You Are?. Barratt is 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.