Sir Nicholas Grattan Grattan-Doyle (18 August 1862 – 14 July 1941) was a Unionist Party politician in the United Kingdom.
He contested the January 1910 General Election as Liberal Unionist candidate or Gateshead, finishing second.
He was elected as Member of Parliament (MP) for Newcastle upon Tyne North at the 1918 general election, and held the seat until his resignation in 1940, aged 78, the age he was when he died the following year.