Sir John Mellor, PC (1 January 1809 – 26 April 1887) was an English judge and Member of Parliament.

He entered law, joined the midland circuit, and practised at Leicester borough and Warwick sessions, at assizes, and at the parliamentary bar.

Following failed attempts in 1852 (at Warwick) and 1857 (at Coventry) he was elected to Parliament to represent Great Yarmouth in 1857, and Nottingham in 1859.

[1] Mellor was one of the two judges at the special commission set up in Manchester in 1867 to try those accused of the murder of Police Sergeant Charles Brett.

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