Richard Best PC(Ire) KC (c. 1869 – 23 February 1939) was an Irish barrister, judge and politician.
Best was born in Richhill, County Armagh. He was educated at Trinity College, Dublin and was called to the bar by the King's Inns, Dublin in 1895. He took silk in 1912 and was elected a bencher in 1918. In 1921 he was elected to the House of Commons of Northern Ireland as Unionist member for Armagh and later the same year he was appointed Attorney General for Northern Ireland. He was appointed to the Privy Council of Ireland in the 1922 New Year Honours, entitling him to the style "The Right Honourable".
In 1925, he was appointed a Lord Justice of Appeal of the Supreme Court of Northern Ireland, a position he held until his death.