In 1907 he married Domini Elliadi who was also active in Liberal politics.
He was elected during the 1906 Liberal landslide gaining Warrington from the Conservative Robert Pierpont. He was re-elected in January 1910 but defeated by the Conservative Harold Smith in December 1910. He was created a baronet, of Highgate in the County of Middlesex, on 24 June 1915. He was interested in the Balkans, and wrote The Settlement of the Near East, published in 1922.
From his parent, he inherited the business of Joseph Crosfield and Sons, soap and candle maurers. He sold the company in 1911 and built Witanhurst on the proceeds, being the largest house in London besides Buckingham Palace. He was a keen golfer and won many championships. Crosfield was also Chairman of National Playing Fields Association, for which he was appointed a Knight Grand Cross of the Order of the British Empire (GBE) in 1929. He served as a School Governor for Highgate School from 1929–1930.
- "No. 29242". The London Gazette. 27 July 1915. p. 7321.
- "No. 33472". The London Gazette (Supplement). 1 March 1929. p. 1440.
- Ed Caesar, 1 June 2015. House of Secrets, The New Yorker
- "Sir A. Crosfield's Fall from Train". The Manchester Guardian. 30 September 1938. p. 13.
A verdict of accidental death was recorded by the Coroner (Mr. Bentley Purchase) at the inquest at St. Pancras yesterday on Sir Arthur Crosfield, who fell from the Geneva-Ventimiglia express at Muy, France, last Thursday. ... When about three-quarters of an hour from Cannes the porter called out that her [Lady Crosfield's] husband had fallen out of the window. Sir Arthur was always very fond of fresh air and liked open windows.
|Parliament of the United Kingdom|
| Member of Parliament for Warrington
1906 – December 1910
|Baronetage of the United Kingdom|
|New creation|| Baronet
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