Joseph Martin Riordan AO (27 February 1930 – 19 November 2012) was an Australian politician and briefly government minister.

He was Minister for Housing and Construction from June 1975 until the dismissal of the Whitlam Government in November 1975.

[4] Riordan was Senior Deputy President of the Australian Industrial Relations Commission from 1986 to 1995.

[2] He was made an Officer of the Order of Australia (AO) in January 1995 for "service to industrial relations, to social justice and to the Community".

[6] He was the nephew of Darby Riordan, the Labor member of the House of Representatives for Kennedy from 1929 to 1936.