'''SF9''' ({{Ko-hhrm|에스에프나인}}; singkatan dari '''Sensational Feeling 9''') adalah [[grup vokal pria|boy group]] asal [[Korea Selatan]] yang merupakan dance boy group pertama dari [[FNC Entertainment]].<ref>{{cite web|title=FNC Entertainment to debut first ever boy dance group 'SF9'|url=http://www.allkpop.com/article/2016/08/fnc-entertainment-to-debut-first-ever-boy-dance-group-sf9|website=AllKpop|accessdate=9 September 2016}}</ref> SF9 debut pada tanggal 5 Oktober 2016 dengan merilis album single, ''[[Feeling Sensation]]'',dengandan lagu utama berjudul ''"Fanfare"''.<ref>{{cite web|title= FNC's SF9 to debut on October 5th releases debut schedule poster|url=http://www.allkpop.com/article/2016/09/fncs-sf9-confirms-debut-date-for-october-5th-releases-debut-schedule-poster|website=Allkpop|accessdate=8 October 2016}}</ref> Grup ini terdiri dari delapan anggota: [[Youngbin]], [[Inseong]], [[Lee Jae-yoon (penyanyi)|Jaeyoon]], [[Dawon]], [[Zuho]], [[Yoo Tae-yang|Yoo Taeyang]], [[Hwiyoung]] dan [[Kang Chan-hee|Chani]]. Awalnya grup beranggotakan sembilan orang, [[Rowoon]] keluar dari grup pada 18 September 2023.<ref>{{cite web|title=Rowoon To Halt Group Activities + SF9 To Continue With 8 Members|url=https://www.soompi.com/article/1614528wpp/rowoon-to-halt-group-activities-sf9-to-continue-with-8-members|website=Soompi|accessdate=18 September 2023}}</ref> SF9 memiliki serial [[Drama Korea|dramawebdrama]] interaktif pra-debut yang berjudul ''"Click Your Heart"'' (2016) dengan total 7 episode.<ref>{{cite web|url = https://www.soompi.com/article/828945wpp/aoas-mina-and-neoz-school-trainees-confirmed-for-fnc-entertainments-web-drama |title= NEOZ SCHOOL Trainees Released From FNC Entertainment’s Web Drama ''Click Your Heart'' |date=03 March 2016}}</ref> SF9 sukses mendapatkan kemenangan pertamanya setelah 3 tahun debut di [[M Countdown]] pada 16 Januari 2020 dan di [[Music Bank]] pada keesokan harinya dengan lagu ''"Good Guy"''.<ref>{{cite web|title= SF9 Takes Emotional 1st Ever Win On “M Countdown” With “Good Guy"|url=https://www.soompi.com/article/1377417wpp/watch-sf9-takes-emotional-1st-ever-win-on-m-countdown-with-good-guy-performances-by-ateez-momoland-and-more|website=Soompi|accessdate=16 Januari 2020}}</ref><ref>{{cite web|title= SF9 Takes Their 2nd Win For “Good Guy” On “Music Bank”|url=https://www.soompi.com/article/1377581wpp/watch-sf9-takes-their-2nd-win-for-good-guy-on-music-bank-performances-by-momoland-younha-ateez-and-more|website=Soompi|accessdate=17 Januari 2020}}</ref> SF9 memilikimenamai fandomfanclub mereka dengan sebutan 'Fantasy'.
Saat ini, anggota [[Lee Jae-yoon|Jaeyoon]] sedang menyelesaikan dinas [[Wajib militer di Korea Selatan|wajib militer]] dan SF9 aktif sebagai grup beranggotakan 7 orang. {{small|(Per 5 Oktober 2023)}}