Daniel O'Neill

Dan O'Neill or Daniel O'Neill may refer to:


 * Dan O'Neill (Gaelic footballer), (1933-2015), Irish Gaelic footballer
 * Dan O'Neill (born 1942), American cartoonist
 * Dan O'Neill (born 1948), founder of Mercy Corps
 * Dan O'Neill (writer) (born 1950), Alaskan journalist and author
 * Daniel O'Neill (painter) (1920–1974), Irish Romantic painter
 * Daniel O'Neill (Royalist) (c. 1612–1664), Irish army officer, politician and courtier
 * Daniel O'Neill (editor) (1830–1877), editor and owner of the Pittsburgh Dispatch newspaper