Mary Wollstonecraft Shelley (née Godwin; 30 August 1797 - 1 February 1851) was an English novelist, short story writer, dramatist, essayist, biographer, and travel writer, best known for her Gothic novel Frankenstein (1818). She also edited and promoted the works of her husband, the Romantic poet and philosopher Percy Bysshe Shelley. Her father was the political philosopher William Godwin, and her mother was the philosopher and feminist Mary Wollstonecraft.

After Wollstonecraft's death less than a month after her daughter Mary was born, Mary was raised by Godwin, who was able to provide his daughter with a rich, if informal, education, encouraging her to adhere to his own liberal political theories. When Mary was four, her father married a neighbour, with whom, as her stepmother, Mary came to have a troubled relationship.

In 1814, Mary began a romance with one of her father's political followers, Percy Bysshe Shelley, who was already married. Together with Mary's stepsister Claire Clairmont, Mary and Shelley left for France and travelled through Europe. Upon their return to England, Mary was pregnant with Percy's child.

In 1816, the couple famously spent a summer with Lord Byron, John William Polidori, and Claire Clairmont near Geneva, Switzerland, where Mary conceived the idea for her novel Frankenstein. The Shelleys left Britain in 1818 for Italy, where Mary Shelley gave birth to a son. A year later, Mary Shelley returned to England and from then on devoted herself to the upbringing of her son and a career as a professional author.