Squad Leader is a tactical level board war game originally published by Avalon Hill in 1977. It was designed by John Hill and simulates on infantry combat in Europe during World War II. One of the most complex war games of its time, Squad Leader is the natural extension of the trend towards greater realism initiated by several earlier games, including Avalon Hill's own PanzerBlitz and Panzer Leader. Those two earlier games were slightly larger in scope, with counters representing platoons and map hexes measuring 250 metres across, compared to Squad Leader's 40 meter hexes and squad sized units.

Tactical wargames are a type of wargame that models military conflict at a tactical level, i.e. units range from individual vehicles and squads to platoons or companies. These units are rated based on types and ranges of individual weaponry. The first tactical wargames were played as miniatures, extended to board games, and they are now also enjoyed as video games.