G-Shock (Gravitational Shock) is a brand of watches manufactured by Casio, which is designed to resist mechanical shocks and vibrations. They are primarily designed for sports, military and outdoor-oriented activities. G-SHOCK watches have a distinct style, and nearly all have some kind of stopwatch feature, countdown time, and light and water resistance.

Since 1983, G-Shock has been setting the standards in toughness. Shock-resistant construction stands up to dropping and other rough treatment plus 200m water resistance.