The Nichiren Honmon Sect (Also known as Honmon Sect) is a sect based on Nichiren Buddhism, which was organized by Nikkomon School (a branch temple succeeding the Nikko's Buddhist teaching lineage) in 1876, and merged with the Nichiren Sect and the Kenpon Hokke Sect in 1941 in order to form a better organization.
日蓮本門宗（にちれんほんもんしゅう、本門宗）は、日興門流（＝日蓮の弟子日興の法脈を受け継ぐ本山末寺）が1876年（明治9年）に結成し、1941年の日蓮宗、顕本法華宗との三派合同によって発展解消した、日蓮系の宗派。