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: or, The Modern Prometheus" (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 neighbor, 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, the then married Percy Bysshe Shelley. Together with Mary's stepsister Claire Clairmont, Mary and Shelley left for France and traveled through Europe. Upon their return to England, Mary was pregnant with Percy's child. Over the next two years, she and Percy faced ostracism, constant debt, and the death of their prematurely born daughter. They married in late 1816, after the suicide of Percy Shelley's first wife, Harriet.

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 their second and third children died before Mary Shelley gave birth to her last and only surviving child, Percy Florence Shelley. In 1822, her husband drowned when his sailing boat sank during a storm near Viareggio. 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. The last decade of her life was dogged by illness, probably caused by the brain tumor that was to kill her at the age of 53.

Until the 1970s, Mary Shelley was known mainly for her efforts to publish her husband's works and for her novel "Frankenstein", which remains widely read and has inspired many theatrical and film adaptations. Recent scholarship has yielded a more comprehensive view of Mary Shelley's achievements. Scholars have shown increasing interest in her literary output, particularly in her novels, which include the historical novels "Valperga" (1823) and "Perkin Warbeck" (1830), the apocalyptic novel "The Last Man" (1826), and her final two novels, "Lodore" (1835) and "Falkner" (1837). Studies of her lesser-known works, such as the travel book "Rambles in Germany and Italy" (1844) and the biographical articles for Dionysius Lardner's "Cabinet Cyclopaedia" (1829-46), support the growing view that Mary Shelley remained a political radical throughout her life. Mary Shelley's works often argue that cooperation and sympathy, particularly as practiced by women in the family, were the ways to reform civil society. This view was a direct challenge to the individualistic Romantic ethos promoted by Percy Shelley and the Enlightenment political theories articulated by her father, William Godwin