Patrick Marnham (born 1943) is an English writer, journalist and biographer. He was elected as a Fellow of the Royal Society Literature in 1988. He is primarily known for his travel writing and for his biographies, where he has covered subjects as diverse as Diego Rivera, Georges Simenon, Jean Moulin and Mary Wesley. His most recent book, published in September 2020, is War in the Shadows: Resistance, Deception and Betrayal in Occupied France, an investigation into the betrayal of a British resistance network in the summer of 1943.