Sir Thomas Andrewes (died 1659) was a London financier who supported the parliamentary cause during the English Civil Wars, and sat as a commissioner at the High Court of Justice for the trial of Charles I. During the Third English Civil War, as Lord Mayor of London, he made sure that there was no trouble in London. During the Interregnum he supported Oliver Cromwell, and was knighted by him in 1657. Many sources confuse him with another , who had a more prominent role in the British East India Company and was a contemporary of the London politician; this other Andrewes was still alive in 1660.