Margaret Buckley (née Goulding) (Irish: Maighréad Uí Bhuachalla (née Ní Ghabhláin)) (1879 – 24 July 1962) was an Irish republican and leader of Sinn Féin from 1937 to 1950.
Originally from Cork, she joined Inghinidhe na hÉireann, which was founded in 1900, taking an active role in the women's movement. She was involved in anti-British royal visit protests in 1903 and 1907 and was among the group that founded An Dún in Cork in 1910. In 1906, she married Patrick Buckley, described as "a typical rugby-playing British civil servant". After his death she moved into a house in Marguerite Road, Glasnevin, Dublin. Later, she returned to Cork to care for her elderly father.
Arrested in the aftermath of Easter Rising she was released in the amnesty of June 1917 and played a prominent role in the reorganisation of Sinn Féin. She was involved in the War of Independence in Cork.
After the death of her father, she returned to Dublin. In 1920, she became a Dáil Court judge in the North city circuit, appointed by Austin Stack, the Minister for Home Affairs of the Irish Republic.
She opposed the Anglo-Irish Treaty and was interned in Mountjoy and Kilmainham, where she went on a hunger strike. She was released in October 1923. During her imprisonment, she was elected Officer Commanding (OC) of the republican prisoners in Mountjoy, Quartermaster (QM) in the North Dublin Union and OC of B-Wing in Kilmainham. She was an active member of the Women Prisoners' Defence League, founded by Maud Gonne and Charlotte Despard in 1922.