Nikolaevsk could be:

• Nikolaevsk, Alaska
• Nikolayevsk-on-Amur, a town in Khabarovsk Krai, Russia
• Nikolaevsk-Na-Amure Air Enterprise
• Nikolayevsk, a town in Volgograd Oblast, Russia

• Mater Dei High School (Breese, Illinois)
• Mater Dei High School (Santa Ana, California)
• Mater Dei Institute of Education
• Mater Hospital
• Material (band)
• Material cause
• Material conditional
• Material consideration
• Material culture
• Material culture of the Manasir
• Material derivative
• Material dispersion coefficient
• Material efficiency
• Material engineering
• Material Engineering
• Material equality
• Material equivalence
• Material Exchange Format
• Material fallacy
• Material feminism
• Material Girl
• Material Girls
• Material implication (rule of inference)
• Material Input Per Unit of Service
• Material input per unit of service