Joseph P. McGuinness (12 April 1875 – 31 May 1922) was an Irish Sinn Féin politician and Member of Parliament (MP) from 1917 until his death in 1922.

He is known for winning the South Longford by-election in 1917[1] while serving a prison sentence for his role in the Easter Rising.

[4] He also joined the Irish Volunteers, serving as a lieutenant in ‘C’ company, 1st battalion, which was commanded by Ned Daly.

After the defeat of the uprising, McGuinness was sentenced to ten years' penal servitude (later reduced to three), and was transferred to HM Prison Lewes with other fighters.

On 3 May 1922 McGuiness was appointed to the so-called "Committee of Ten" established by the Dáil in an effort to stave off the looming civil war.