Quilcayhuanca[1][2] (possibly from Quechua qillqay to write, wank'a rock,[3] possibly "rock with inscriptions"), Quillcay,[4] Quilcay[5][6] or Qelkaywanka[7] is a river in the Ancash Region in Peru.

[2] The river originates in the Cordillera Blanca west of Tullparaju near the lake Tullpaqucha.

From the point of the confluence with the Paria River in the east of the town Huaraz it receives the name Quillcay.

It is one of the tourist attractions of the Huaraz Province with views of snow-capped mountains (like Andavite, Churup, Pucaranra, Chinchey and Tullparaju) and visits to glacial lakes and rock paintings.

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