John Portineus Greene (September 3, 1793 – September 20, 1844) was an early leader in the Latter Day Saint movement. Greene was born in Herkimer, New York. He was a Methodist minister at Mendon, New York. He was friends with Heber C. Kimball and they claimed to witness "signs in the heavens" on September 22, 1827. He later met Latter Day Saint missionary Samuel Harrison Smith, who sold Greene a copy of the Book of Mormon. Greene joined the Latter Day Saint church in April 1832, as did the family of his wife Rhoda, which included Brigham Young.