The arytenoid muscle /ærɪˈtiːnɔɪd/ or interarytenoid muscle is a composite intrinsic muscle of the larynx, consisting of a transverse part and an oblique part - the two parts may be considered as separate muscles: an unpaired transverse arytenoid muscle, and a bilaterally paired oblique arytenoid muscle.

[1] The two constituent parts differ in their attachments, structure and actions.

[1] Function of the arytenoid muscle is a good method to determine function of the recurrent laryngeal nerve.

[2] Continuous electromyography of the arytenoid muscle can provide confidence to surgeons that the recurrent laryngeal nerve is not damaged during neck surgeries, such as thyroidectomy.

[2] The arytenoid muscle is found in many animals, including dogs.