The Kulin nation is an alliance of five Indigenous Australian tribes in south central Victoria, Australia.

Their collective territory extends around Port Phillip and Western Port, up into the Great Dividing Range and the Loddon and Goulburn River valleys.

Before British colonization, the tribes speak five related languages.

These languages are spoken in two groups: the Eastern Kulin group of Woiwurrung, Boonwurrung, Taungurong and Ngurai-illam-wurrung; and the western language group of just Wathaurung.

The central Victoria area has been inhabited for an estimated sixty thousand to one hundred thousand years before European settlement.

At the time of British settlement in the 1830s, the collective populations of the Woiwurrung, Boonwurrung and Wathaurong tribes of the Kulin nation is estimated to be under twenty thousand.

The Kulin live by fishing, hunting and gathering, and make a sustainable living from the rich food sources of Port Phillip and the surrounding grasslands.

Due to the upheaval and disturbances from British settlement from the 1830s on, there is limited physical evidence of the Kulin peoples' collective past.

However, there is a small number of registered sites of cultural and spiritual significance in the Melbourne area.