Pyhä apostoli Simon Kiivailija, muistopäivä 10. toukokuuta, jota kutsutaan myös nimellä Simon Kananeus, oli yksi Jeesuksen kahdestatoista opetuslapsesta, joita nimitettiin apostoleiksi. Lisänimen ’Kiivailija’ hän sai erotukseksi toisesta Simon-nimisestä apostolista, Simon Pietarista. Raamatussa Matteuksen ja Markuksen evankeliumeissa (Mark.3:18) häntä nimitetään Simon Kananeukseksi, ja Luukkaan evankeliumissa (Luuk.6:15) sekä Apostolien teoissa (Apt.1:13) Simon Kiivailijaksi (kiivailija on kreikaksi Ζηλωτής / zelotes / Simon Zelotes). 

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