Ernest Kavanagh (1884 – 25 April 1916) was a Dublin born cartoonist who contributed to a number of political publications in the early part of the 20th century.
He provided cartoons for The Irish Worker newspaper of James Larkin's Irish Transport and General Workers' Union.
He produced cartoons published alongside poems by his sister the writer and poet Maeve Cavanagh McDowell.
As well as supporting the working class, his cartoons attacked the recruitment drive for World War One and supported the suffragette movement.
A non-combatant, he was struck and killed by a bullet during the Easter Rising, on 25 April 1916.