The Vektor CR-21 is a South African bullpup assault rifle ("CR-21" being an abbreviation of Combat Rifle 21st Century) chambered for 5.56×45mm NATO ammunition. It was designed by Denel Land Systems as a possible replacement for the South African National Defence Force's Vektor R4, though Denel Land Systems has since shifted focus to offering an upgraded R4 rifle to the SANDF instead.

200 CR-21s were made in total with parts that can be used for another 200 CR-21s.