Nikken Abe (阿部日顕, Abe Nikken; also known as Nikken Shonin; 19 December 1922 – 20 September 2019) was a Japanese Buddhist monk who served as the 67th High Priest of Nichiren Shōshū Buddhism and chief priest of Taiseki-ji head Temple in Fujinomiya, Japan. Nikken Shonin was instrumental in founding new temples and propagation centers outside Japan well into his final years in office. He retired as High Priest on 15 December 2005 and was succeeded by Hayase Nichinyo Shonin. Abe died on 20 September 2019 in his private residence in Nakamachi street, in Setagaya ward of Tokyo, aged 96.