Maurits Lammertink (born 31 August 1990) is a Dutch former cyclist, who rode professionally in road bicycle racing and cyclo-cross between 2011 and 2021. During his professional career, Lammertink took three victories – he won a stage of the 2015 Tour du Limousin, the general classification of the 2016 Tour de Luxembourg, and a stage of the 2017 Tour of Belgium. He also contested four Grand Tours between 2013 and 2018.

In June 2021, Lammertink was struck by a scooter while with family members near his home in Hengelo, suffering a brain haemorrhage and multiple other injuries. When interviewed by Algemeen Dagblad in 2024, Lammertink stated that he had been left with permanent brain damage as a result of the incident.