The National High School of Mathematics and Natural Sciences "Academician Lyubomir Chakalov" (in Bulgarian: Национална природо-математическа гимназия "Академик Любомир Чакалов") is a high school (European secondary school) in Sofia, Bulgaria.

The school is named after the Bulgarian mathematician Lyubomir Chakalov.

They are divided into seven majors: НПМГ Alumni Club was established in 2017.

Its mission is to create long-term connections between alumni of the gymnasium, as well as enrich the learning process of current students through lectures, workshops, and other academic and social events.

This Bulgarian school-related article is a stub.