Quillcay Machay or Qillqay Mach'ay (Quechua qillqay to write, mach'ay cave,[1][2] Hispanicized spelling Quillcay Machay) is an archaeological site in Peru.

It is situated in the Huánuco Region, Huamalíes Province, Singa District.

[3] The site is known for its rock paintings.

[3] It was declared a National Cultural Heritage of Peru by Resolución Directoral No.

This article relating to archaeology in Peru is a stub.