The frontalis muscle (from Latin, meaning 'frontal muscle') is muscle which covers parts of forehead of the skull. Some sources consider the frontalis muscle to be a distinct muscle. However, Terminologia Anatomica currently classifies it as part of the occipitofrontalis muscle along with the occipitalis muscle.

In humans, the frontalis muscle only serves for facial expressions.

The frontalis muscle is supplied by the facial nerve[4] and receives blood from the supraorbital and supratrochlear arteries.