We all know the stories about the tribes of Africa and South America, who were never before contacted by modern life but what about Europe? Have there ever been cases of european tribes still existing somewhere on the continent?
Would the Sámi people / Laplanders of northern Scandinavia, Finland, and Kola Peninsula count?
They were a semi-nomadic people that are protected under international conventions of indigenous people.
There are tribes/clans in Montenegro, Albania and parts of Serbia that still exist today. They, of course, do not look like tribes of South America and Africa but they retained the loose connection between the families to this day.
Up to early XX century they resembled the popular idea of the tribe more, especially in the most remote highland areas of northern Albania and Montenegro. Albanian tribes were practically independent, governed themselves under the local custom law called Lek Dukagjin famous for the proliferation of the blood feuds. Montenegrin tribes were ruled by bishop prince (Vladika). All the tribes were highly patriarchal societies, frequently fighting against the Ottomans, Austrians and between themselves. Some of the tribes that in a way still exist are: Vasojevići, Kuči, Bjelopavlići and many others. It is somewhat difficult to find good sources on the subject in English but maybe this can help. The history of those tribes is very rich and interesting subject. I'm just an amateur so I hope that someone more knowledgeable can add more to the discussion.
EDIT: Just found another link that looks reputable so here it is.