Stephen Peter Rigaud (1774 – 1839) was an English mathematical historian and astronomer. He was a Fellow of Exeter College, Oxford from 1794 to 1810, held the Savilian Chair of Geometry at the University of Oxford from 1810 to 1827, and was Savilian Professor of Astronomy from 1827 to 1839.
Rigaud came from a French Protestant family, and was the son of Stephen Rigaud, Observer at Kew Observatory. He lived at 21 Richmond Green in Richmond, Surrey (now Richmond, London). He was educated in Richmond and at Exeter College, Oxford.
- Historical essay on the first publication of Sir Isaac Newton’s Principia (First published 1838)
Rigaud's papers, purchased at Sotheby's in 1978, are held at the Bodleian Library, University of Oxford.
The Ashmolean Museum of Art and Archaeology in Oxford has a portrait by his uncle John Francis Rigaud. "Peter Rigaud and Mary Anne Rigaud", exhibited at the Royal Academy in 1778, shows Stephen Peter Rigaud aged four, and his elder sister, Mary Anne, aged seven, playfully embracing each other in Richmond Park; the building in the background of the portrait is Kew Observatory.