Constance Georgine Markievicz (Polish: Markiewicz [marˈkʲɛvitʂ]; née Gore-Booth; 4 February 1868 – 15 July 1927), also known as Countess Markievicz and Madame Markievicz, was an Irish revolutionary nationalist politician, suffragist and socialist who was the first woman elected to the Parliament of the United Kingdom. She came from the upper class Anglo-Irish Protestant landowning elite of Ireland, which she abandoned in favour of Irish independence and social reform.

She served as Member of Parliament (MP) for Dublin St Patrick's from 1918 to 1922. In the Irish Free State, she was elected Minister for Labour in the First Dáil, becoming the second female cabinet minister in Europe. She served as a Teachta Dála for the Dublin South constituency from 1921 to 1922 and 1923 to 1927.

A founding member of Fianna Éireann, Cumann na mBan and the Irish Citizen Army, she took part in the Easter Rising in 1916, when Irish republicans attempted to end British rule and establish an Irish Republic. She was sentenced to death but her sentence was commuted to life imprisonment on the grounds of her sex. On 28 December 1918, she was the first woman elected to the UK House of Commons, though, being in Holloway Prison at the time and in accordance with party policy, she did not take her seat. Instead, she and the other Sinn Féin MPs (as TDs) formed the first Dáil Éireann. She was also one of the first women in the world to hold a cabinet position, as Minister for Labour, from 1919 to 1922.

Markievicz supported the anti-Treaty stance in the Irish Civil War. She continued as an (abstentionist) Dáil member for Sinn Féin until 1926 when she became a founding member of Fianna Fáil. She died in 1927.