Müsli may refer to:

• an alternative spelling of Muesli, a breakfast dish based on raw rolled oats and other ingredients
• a diminutive term for a mouse in Swiss German
• Müsli, Glarus, a hamlet near the village of Elm in the Swiss canton of Glarus

Muesli ( or ; Swiss German: Müesli , non-Swiss Standard German: Müsli ) is a  breakfast and brunch dish based on raw rolled oats and other ingredients including grains, fresh or dried fruits, seeds and nuts, and may be mixed with cow's milk, soy milk, almond milk, yogurt or fruit juice. Developed around 1900 by Swiss physician Maximilian Bircher-Benner for patients in his hospital, muesli is available in a packaged dry form, ready made, or freshly made.