A moment of silence (also referred to as a minute's silence or a one-minute silence) is a period of silent contemplation, prayer, reflection, or meditation. Similar to flying a flag at half-mast, a moment of silence is often a gesture of respect, particularly in mourning for those who have died recently, or as part of a tragic historical event, such as Remembrance Day.

A minute, or 60 seconds, is a common length of time for the memorialization, though organizers may choose other periods of time, normally connected in some way with the event being commemorated (there might be a minute given for every death commemorated, for example). During a moment of silence, its participants may typically bow their heads, remove their hats, and refrain from speaking, or moving, for the duration of it.