If you see colonialism as a foreign group establishing control over a people and region over a long time, then:
* The Roman Empire colonized Europe for hundreds of years
* Napoleon colonized most of continental Europe (this one might be debatable)
* The British colonized Ireland and Scotland
* The Ottomans colonized the Balkans
* Muslim Caliphates colonized Spain/Al-Andalus
* The Vikings colonized areas around the north sea.
And probably a lot of smaller scales things I am missing.