Margaret Irene O'Bryan, GM (née Anderson; 11 December 1915 – 16 July 1995) was an Australian Army nurse.

Anderson was awarded a George Medal for her heroism while caring for the wounded at sea after the invasion of Singapore in 1942.

She and Vera Torey, who she had trained with in Heidelberg, were assigned to the 13th General Hospital which was itself moving from Singapore to Tampoi.

[3] These people were British and Australian military and 133 army nurses, including Anderson.

[3] The ship had set sail with would-be passengers held back at gun point.

[6][7] Anderson was awarded the George Medal,[8] and Torney was appointed a Member of the Order of the British Empire.

[1] After the war Anderson worked as a clerk in Malvern and married Allen Ronald O'Bryan in 1956.