Simmering is a cooking technique in which foods are cooked in hot liquids kept at or just barely below the boiling point of water (at average sea level air pressure), 100 °C (212 °F). To keep a pot simmering, one brings it to a boil and then adjusts the heat downward until just before the formation of steam bubbles stops completely. Water normally begins to simmer at about 94 °C or 200 °F. In Japanese cuisine, simmering is considered one of the four essential cooking techniques (along with grilling, steaming, and deep frying).

Simmering is also the name of a district of Vienna.