Kate O'Malley may refer to:
Kathleen M. O'Malley (born 1956), United States federal judge Katie O'Malley (born 1962), Maryland state court judge, and first lady of Maryland Kate O'Malley, a British actress active in the 1990s who was a regular on the last two seasons of Soldier Soldier Kate O'Malley, a fictional character on the CBS show Queens Supreme, portrayed by Sarah Wayne Callies