Democratic Republic of Congo, Hemba people - The extremely stylized chimpanzee masks are called mwisi gwa so'o a term that alludes to the "spirit-ivested object of the chimpanzee human" that inhabits the mask
028. Inuit mask dancing, Alaska 
Masque, Archipel de Kodiak, Alaska, collecté en 1871/2 par Alphonse Pinart (1852-1911)
Ngil Mask Fang People, Gabon
German old folk art face mask, carved wood
Kyogen Mask of Usobuki. What a great expression.
Africa | Face mask from the Nunuma people of Burkina Faso | Wood, encrusted patina and polychrome paint.
Beautiful Indonesian Wooden Masks Light Weight Smile Now, Cry Later 10 inches
Ibibeo People, Southern Nigeria, Eket Mask, in carved and painted wood, circa 1960. 18" x 16"
Owl spirit mask from the Lower Yukon River, Alaska