The Criminal Lunatics Act 1884 (47 & 48 Vict. c. 64) was an act of the Parliament of the United Kingdom that consolidated enactments relating to mentally ill offenders in England and Wales.
Leave to bring in the Criminal Lunatics Bill to the House of Commons was granted to J. T. Hibbert and the Home Secretary, Sir William Harcourt on 19 June 1884. The bill had its first reading in the House of Commons on 19 June 1884, presented by J. T. Hibbert . The bill had its second reading in the House of Commons on 26 June 1884 and was committed to a committee of the whole house. The committee was discharged on 27 June 1884 and was committed to the Standing Committee on Law, and Courts of Justice, and Legal Procedure, which reported on 17 July 1884, with amendments. The amended bill had its third reading in the House of Commons on 31 August 1884 and passed, without amendments.
The bill had its first reading in the House of Lords on 1 August 1884. The bill had its second reading in the House of Lords on 5 August 1884 and was committed to a committee of the whole house, which met reported on 7 August 1884, without amendments. The bill had its third reading in the House of Lords on 8 August 1884 and passed, with amendments.
The amended bill was considered and agreed to by the House of Commons on 8 August 1884.
The bill was granted royal assent on 14 August 1884.
Section 17 of the act repealed 11 enactments, listed in the first schedule to the act. Section 17 of the act also provided that the repeals would not affect any warrant issued or order made under the repealed enactments.
The act was described as a consolidation act.
The whole act was repealed by section 121 of, and the fifth schedule to, the Mental Health Act 1959 (7 & 8 Eliz. 2. c. 72).