Lammert is a given name derived from Lambert and a surname. Notable people with the surname include:
Given name Pieter Lammert Bon (born 1946), Dutch rower (born 1932), Dutch theologian and university-president Lammert Bouke van der Meer (born 1945), Dutch classicist and classical archeologist Lammert Swart (1847–1909), Dutch commander of the Royal Netherlands East Indies Army
Surname Lammert Christian Lammert Edmund Lammert (1847–1921), German classical philologist Mark Lammert (born 1960), German painter, illustrator, graphic artist, and stage-designer Matthias Lammert (born 1968), German politician Norbert Lammert (born 1948), German politician Petra Lammert (born 1984), German shot-putter and bobsledder Will Lammert (1892–1957), German sculptor
Lammerts Johan Lammerts (born 1960), Dutch road bicycle racer