John P. Sullivan (April 23, 1843 – September 30, 1898) was a farmer, merchant and political figure on Prince Edward Island. He represented 2nd Kings in the Legislative Assembly of Prince Edward Island from 1890 to 1893 as a Conservative.He was born in New London, Prince Edward Island, the son of William Sullivan and Mary McCarthy, Irish immigrants. He was a general merchant in St. Peters. He was married twice: to Ellen MacDonald in 1873 and Helen MacDonald in 1877.