Arnold Muir Wilson (1857 – 1 October 1909) was a British solicitor and politician.
Born in Sheffield, Wilson studied in Germany before becoming a solicitor based at Clifford's Inn. He built up a large practice in Sheffield, usually representing the defence at the Police Court, against Arthur Neal. He was a key figure in the formation of an Amateur Parliament in the city, and in 1883 he was elected to Sheffield City Council for the Conservative Party. He was also known as an early motorist and mountaineer.
In 1891, Wilson objected to an attack on him in the Sheffield Anarchist, and successfully sued its editor, John Creaghe, for libel. Although he won the case, no damages were awarded, as the judge believed that the newspaper could only inflict injury on those who read it.
In 1898, Wilson was appointed as an honorary consul for Serbia, and he attempted to use the position to promote British trade with the nation. In 1904, he travelled to Belgrade and worked with Frank Mottershaw to film the coronation of Peter I. This is the oldest surviving film shot in Serbia.
In the 1900s, Wilson became known for his outspoken attacks on well-known figures in Sheffield. When Lib-Lab councillor Charles Hobson appeared to have received a bribe for making a favourable land deal, Wilson brought a private prosecution against him. Hobson was found guilty and sentenced to three months in prison, but public opinion was that the sentence was harsh.
Wilson stood for the Conservatives in Sheffield Attercliffe at the 1906 general election, taking 46.8% of the vote. In 1907, he began a lengthy trip around the world. Despite this, he objected to the nomination of an alternative Conservative candidate in the Sheffield Attercliffe by-election, 1909, and ensured he was nominated as an independent Conservative. He returned to Sheffield to campaign on a protectionist platform, under the slogan "Vote for the Tory Chicken!! Kill the London Cuckoo!!". He took a strong fourth place, with 21.7% of the votes cast. The week after the election, he called a public meeting, at which he complained that he had spent £1,100 on contesting the 1906 and 1909 elections, and "if that is not enough to buy the seat of Attercliffe, I don't know what is". Later in the month, he sued the Conservative candidate for assault on the election night, and for damage to his bowler hat, but the case was dismissed before Muir Wilson was able to give evidence.