Qillqatani (Aymara qillqaña to write, -ta a suffix to indicate the participle, -ni a suffix to indicate ownership, "the one with something written", Hispanicized Qelqatani, Quelcatani) is an archaeological site in Peru.

[3] It is located above the Rio Chila, in the Puno Region, El Collao Province, Santa Rosa District, at a height of about 5 m (16 ft) above the riverbed.

Qillqatani is the first archaeological site in the Lake Titicaca basin to be systematically excavated.

[2] From 3660 BP onwards, Qillqatani was inhabited by pastoralist camelid-herders who built houses and began to occupy the site long-term.

[2] These later occupants also began to trade with people from lower attitudes to obtain Chenopodium.