Do you get a proficiency bonus to AC when wearing armor you are proficient with?
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No. Proficiency only allows you to don that type of armor without suffering disadvantage on all rolls involving strength or dexterity. In that way it is mechanically identical to 3.5 armor proficiency, removing a penalty associated to doning an armor you are not proficient with, but serving to no other purpose, other than maybe being a requirement for certain feats.