Sir Walter Armstrong (7 February 1850 Hawick, Roxburghshire – 8 August 1918 London) was a British art historian and author.^[1]

Armstrong was born on 7 February 1850. He was educated at Harrow and Exeter College, Oxford.^{[citation needed]}

For 10 years after 1880 he was art critic to several newspapers, such as the Pall Mall Gazette, the Manchester Guardian, and the old Manchester Examiner. He made his mark in the art world, and was consulted by students and collectors, becoming an authority especially on Dutch 17th-century and English 18th-century painting. Several fine collections, of which that of Mr. S. Joseph, was one, were mainly formed under his advice.

In 1892, he succeeded the late Henry Doyle as Director of the National Gallery of Ireland in Dublin, which his predecessor had reorganized and developed; and in this post Armstrong remained for over 20 years, his services recognized by a knighthood in 1899. During his time in Dublin he wrote many books, among which his stately volumes on Sir Joshua Reynolds, Gainsborough, and Raeburn were the chief, that held a position of authority for many years afterwards. Earlier and later he wrote columns on men so various as Peter De Wint, Velasquez, and Sir Thomas Lawrence, and a book of "Notes" on the National Gallery, containing many suggestive criticisms. Armstrong was said to be quick at absorbing the essential points of contemporary researchers and in judging them by the aid of a keen eye and a clear brain.

In 1873 he married Emily Rose Ferard of Ascot Place, of which there was issue. He died in Westminster on 12 August 1918.^[2] and is buried in a family vault on the Lebanon Circle at Highgate Cemetery (West). Also interred in the family vault is the Armstrong's daughter Mary Beatrice who married Rowland Ponsonby Blennerhassett in 1876.^{[citation needed]}

• The art of William Quiller Orchardson. The Portfolio artistic monographs ;[no. 14]. Seeley and Co. ; Macmillan and Co. 1895.
• Gainsborough and his place in English art. Heinemann ; Scribner. 1898.
• Art in Great Britain and Ireland. 1900.
• Sir Joshua Reynolds, first president of the Royal Academy. W. Heinemann ; C. Scribner's Sons. 1900.
• Sir Henry Raeburn. W. Heinemann; Dodd, Mead & company. 1901.
• Turner. T. Agnew ; C. Scribner's. 1902.^[3]
• The Peel collection and the Dutch school of painting. The Portfolio artistic monographs ;[no. 45]. Seeley and co., limited; E.P. Dutton & co. 1904.
• Lawrence. C. Scribner's. 1913.

• Works by or about Walter Armstrong at Wikisource
• Web page on Walter Armstrong at the National Gallery of Ireland
• Works by Walter Armstrong at Project Gutenberg
• Works by or about Walter Armstrong at the Internet Archive