William Henry Romaine-Walker (1854–1940) was an English architect and interior decorator.

Romaine-Walker was born into a family of art dealers. He was educated at Lancing College, and then articled to the architect George Edmund Street.^[1] He was elected an Associate of the Royal Institute of British Architects in 1881,^[1] and in the same year began working in a partnership with Augustus William Tanner, which lasted until 1896.^[2]

These include:

• Stanhope House, Park Lane, London (1899–1901), ornate Gothic mansion, with Besant.^[3]
• St. James, Hampton Hill, tower added to William Wigginton's earlier church, to celebrate Queen Victoria's Golden Jubilee (1887–88).^[4]
• Canford School, Canford Magna, Dorset, extended (with Tanner) (1888).^[5]
• Medmenham Abbey, Medmenham, Buckinghamshire, west wing added and remainder of the house much restored (1898) for Robert Hudson^[6]
• Danesfield House, Medmenham, Buckinghamshire, for Robert Hudson (1899–1901)^[7]
• Church of St. Saviour, Newtown, Dorset (1892) with Tanner.^[8]
• Beaumont College, Old Windsor, Berkshire: interior decoration (1902).
• Her Majesty's Theatre, London. Interior decoration (1897).^[9]
• St Michael's Church, Brighton (circa 1900). Internal features.^[10]
• Church of St John the Evangelist, Upper Parkstone, Poole, Dorset, with Besant (1902–03).^[11]
• Moreton Hall, Warwickshire (1906)^[12]
• Knowsley Hall, Merseyside. Modifications for the 17th Earl of Derby (1908–12)^[13]
• Tate Gallery extensions (1910, 1926, 1937) ^[14]
• Buckland House, Buckland, Oxfordshire, alterations and additions (c 1910).^[15]
• Chatsworth House rebuilding of main staircase (1911–12).^[16]
• Liverpool Town Hall (1913). Internal modifications and decorations (with Jenkins)^[17]
• Great Fosters. Modifications (1918–19).^[18]