Ian Serraillier (24 September 1912 – 28 November 1994) was an English novelist and poet. He retold legends from England, Greece and Rome and was best known for his children's books, especially The Silver Sword (1956), a wartime adventure story that the BBC adapted for television in 1957 and again in 1971.

Serraillier, born in London on 24 September 1912, was the eldest of the four children of Lucien Serraillier (1886–1919) and Mary Kirkland Rodger (1883–1940). His father died in the 1918 Spanish flu pandemic.

Serraillier was educated at Brighton College, a public school, and at St Edmund Hall, Oxford. He then taught English at Wycliffe College, Gloucestershire in 1936–1939, Dudley Boys Grammar School, Worcestershire, in 1939–1946, and Midhurst Grammar School, West Sussex, in 1946–1961.

As a Quaker Serraillier was granted conscientious objector status in World War II, and served as an air raid warden during the conflict. He was a member of the pacifist Peace Pledge Union.

In 1946, Serraillier published his first three children's books: They Raced for Treasure, a story of sailing, treasure and spies, and Thomas and the Sparrow.

In 1948, he and his wife, Anne Margaret Rogers, founded the New Windmill Series for Heinemann Educational Books, to provide inexpensive editions of worthwhile fiction, travel and biography for older readers. He continued to co-edit the series until the early 1990s.

He wrote more adventure stories, including his best-known one, The Silver Sword (1956), which follows the story of four refugee children, three of them siblings: Ruth, Edek, and Bronia. The fourth, Jan, is another of the many Warsaw war orphans, and has somehow met their father. The four children search for the siblings' parents in the chaos of Europe just after the Second World War. The book appeared in the United States under the title Escape from Warsaw.

The Ivory Horn (1960), a retelling of the Roland legend, was a runner-up for the Carnegie Medal, as had been The Silver Sword.