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Everyone knows what class do use light armor or heavy armor.
But how about unarmored?
Are there some classes do not use any armor in Oblivion?
I know mage doesn't use any armor.And what's more?
What do you think?

http://www.uesp.net/wiki/Oblivion:Classes lists the following standard classes that do not have any type of armour skill:

Acrobat
Agent
Battlemage
Healer
Mage
Monk
Witchhunter

(but still, in-game most NPC Agents, battlemages and healers, and a number of monks and witchhunters, wear armour...)

Rangers are usually pretty unarmored. Take a look at http://oblivion.nexusmods.com/mods/searchresults/?

And why not, you can just play the game not using armor? Your own risk, though, that is.

Rangers aren't defined as a class in Oblivion.