Niendorf (German pronunciation: [ˈniːnˌdɔʁf] ) is a village and a former municipality in the Nordwestmecklenburg district, in Mecklenburg-Vorpommern, Germany. Since May 2019, it is part of the new municipality Siemz-Niendorf.

It is close to the cities of Lübeck, Wismar and Schwerin and is part of the Hamburg Metropolitan Region.