Sir William Chandler Roberts-Austen KCB FRS (3 March 1843 in Kennington – 22 November 1902 in London) was an English metallurgist noted for his research on the physical properties of metals and their alloys.

He later (1885) assumed the name of Roberts-Austen at the request of his uncle, Major Nathaniel Lawrence Austen, as a condition of inheritance.

He was elected a Fellow of the Royal Society in June 1875 and was their Bakerian Lecturer in 1896.

[4] He was largely responsible for the building of St Martin's chapel of ease, Blackheath, Surrey, in 1893.

He died at his residence in the Royal Mint and was buried in St Martin's churchyard, Canterbury, Kent.