Alexander Kristoff (born 5 July 1987) is a Norwegian former road bicycle racer, who last rode for UCI ProTeam Uno-X Mobility and competed professionally from 2006 to 2025.

A sprinter and classics rider, Kristoff is the most successful Norwegian cyclist by number of wins, having taken almost 100 victories during his professional career. He has won four Tour de France stages, the 2014 Milan–San Remo and 2015 Tour of Flanders one-day races – as a result, becoming the only Norwegian rider, as of 2026, to win a cycling monument – and has won medals in the road race at the Olympic Games (2012; bronze), the UCI Road World Championships (2017; silver), and the European Road Cycling Championships (2017; gold). He also holds the record for most wins at the one-day races Eschborn–Frankfurt (four) and the Grand Prix of Aargau Canton (three), and most stage wins at the Tour of Oman (nine), the Tour of Norway (eleven), and the Arctic Race of Norway (seven).