Labor Senators Albert Gardiner, Allan McDougall and Arthur Rae were not up for re-election.
Labor Senators Thomas Givens, James Stewart and Harry Turley were not up for re-election.
Labor Senators Robert Guthrie, Gregor McGregor and William Story were not up for re-election.
Labor Senators James Long, David O'Keefe and Rudolph Ready were not up for re-election.
Labor Senators Richard Buzacott, Hugh de Largie and George Henderson were not up for re-election.