Achille Pierre Dionis du Séjour (January 11, 1734 – August 22, 1794) was a French astronomer and mathematician. Dionis du Séjour was born in Paris and was a distant relative of surgeon and anatomist . He served as an advisor to parliament before he was appointed to the French Academy of Sciences in 1765. He was appointed to the Paris group for the Estates-General of 1789 and was one of the 47 who joined the Estates of the Realm that year. In 1775 he was elected a Fellow of the Royal Society. Dionis du Séjour died in Vernou-la-Celle-sur-Seine.
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