John Dillon Nugent (22 December 1869 – 1 March 1940) was an Irish nationalist politician, insurance representative and company director.
He was born at Keady, County Armagh, the son of grocer John Nugent and Sarah Dillon.
He married in August 1896 and with his wife Mary, née Nolan, had seven children.
He was elected as MP for the constituency of Dublin College Green at the by-election of 11 June 1915 following the death of Joseph Nannetti, defeating the Labour candidate Thomas Farren, who stood on a separatist programme, by 2445 votes to 1816.
He was defeated at the 1918 general election by Michael Staines of Sinn Féin contesting Dublin St Michan's.