|Province:||Warmian-Masurian Voivodeship / East Prussia (before 1939)|
|County:||Mrągowo / Sensburg (before 1939)|
|Community:||Mikołajki / Nikolaiken (before 1939)|
|Other names:||Mikołajki [official language]; Mikołajki [English]; Nikolaiken / Миколайки [German / Russian]|
|GPS:||53.8028° N / 21.5708° E, 53°48'9" N / 21°34'15" E|
Mikołajki (German: Nikolaiken) – is a town in Mrągowo County in the Warmian-Masurian Voivodeship in north-eastern Poland. The town is located in the Masurian Lake District.