He married the journalist Kaye Webb in 1947; they had twins, Kate and Johnny. In 1961, he moved to Paris, leaving his family and later marrying Monica Koenig, a painter, theatre and jewellery designer. After 1975, Searle and his wife lived and worked in the mountains of Haute Provence.
His wife Monica died in July 2011 and Searle died on 30 December 2011, aged 91.
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Early work as war artistAlthough Searle published the first St Trinian's cartoon in the magazine Lilliput in 1941, his professional career really begins with his documentation of the brutal camp conditions of his period as a prisoner-of-war of the Japanese in World War II in a series of drawings that he hid under the mattresses of prisoners dying of cholera. Searle recalled, "I desperately wanted to put down what was happening, because I thought if by any chance there was a record, even if I died, someone might find it and know what went on." But Searle survived, along with approximately 300 of his drawings. Liberated late in 1945, Searle returned to England where he published several of the drawings in fellow prisoner Russell Braddon's The Naked Island. Another of Searle's fellow prisoners later recounted, "If you can imagine something that weighs six stone or so, is on the point of death and has no qualities of the human condition that aren’t revolting, calmly lying there with a pencil and a scrap of paper, drawing, you have some idea of the difference of temperament that this man had from the ordinary human being."
Most of these drawings appear in his 1986 book, Ronald Searle: To the Kwai and Back, War Drawings 1939-1945. In the book, Searle also wrote of his experiences as a prisoner, including the day he woke up to find a dead friend on either side of him, and a live snake underneath his head:
- "You can’t have that sort of experience without it directing the rest of your life. I think that’s why I never really left my prison cell, because it gave me my measuring stick for the rest of my life... Basically all the people we loved and knew and grew up with simply became fertiliser for the nearest bamboo."