An auxiliary bishop is an additional bishop assigned to a large diocese to help the ordinary perform his functions.
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| Timothy O'Mahony Auxiliary Bishop 1879-1892
| Benjamin Webster Auxiliary Bishop 1946-1954
| Francis Allen Auxiliary Bishop 1954-1977
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| Francis Marrocco Auxiliary Bishop 1955-1968
| Thomas Fulton Auxiliary Bishop 1968-1978
| Aloysius Ambrozic Auxiliary Bishop 1976-1990
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| Leonard Wall Auxiliary Bishop 1979-1992
| M. Pearse Lacey Auxiliary Bishop 1979-1993
| Robert Clune Auxiliary Bishop 1979-1997
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| John Knight Auxiliary Bishop 1992-2001
| Nicola De Angelis Auxiliary Bishop 1992-2003
| Terrence Prendergast Auxiliary Bishop 1995-1998
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| R. Anthony Meagher Auxiliary Bishop 1997-2002
| Richard Grecco Auxiliary Bishop 2002-2009
| Daniel Bohan Auxiliary Bishop 2003-2005
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Peter Hundt Auxiliary Bishop 2006-2011
| William McGrattan Auxiliary Bishop 2010-2014
| Wayne Kirkpatrick
Auxiliary Bishop 2012-2019
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