Skullcap or skull cap usually refers to various types of headgear. Specifically it may refer to:
Headwear Arakhchin, traditionally worn by men and women of the South Caucasus Beanie (seamed cap) Biretta, forming part of some clerical, academic or legal dress Calotte (Belgium), a skullcap worn by students at Catholic universities in Belgium Capeline, worn under civilian hats during early modern periods Cervelliere, a medieval metal helmet Jeep cap Kerchief or durag, as stereotypically worn by pirates and often featuring actual skull print Kippah or yarmulke, worn by Jewish men Kufi, worn primarily by men of West African heritage Scrub cap, worn by healthcare professionals while performing procedures Scrum cap, worn by rugby players Sindhi cap worn by Sindhi people of Pakistan, and others Songkok Taqiyah (cap), worn by some Muslim men Tubeteika, a Central Asian cap Tuque, a knit hat Zucchetto, worn by Catholic clergy
Plants and fungi Galerina marginata, a highly toxic mushroom also known as "deadly skullcap" or "autumn skullcap" Scutellaria, a genus of flowering plants also known as "skullcaps" Scutellaria baicalensis ("Baikal skullcap", "Chinese skullcap"), an herb native to eastern Asia Scutellaria lateriflora ("blue skullcap", "American skullcap", "mad dog skullcap", "side-flowering skullcap"), a perennial herb native to North America
See also Calvaria (skull), the top part of the skull