There are no recorded non-Istari wizards in Middle-Earth, but it really depends on what you mean by "wizard".
Before the occupant of Dol Guldor was identified as Sauron, he was called "The Necromancer", which could be described as a wizard that practices death magic, and communing with the dead.
The Mouth of Sauron was described as a Sorcerer.
Boromir notably described Galadriel as "A great sorceress", prior to their meeting.
However, it should be noted that none of these individuals actually performed any overt magic. Most magic in Tolken's world was far more subtle, and described more as a natural art than conjuring. If anything, magic in Middle Earth was more like enchantment, i.e. objects and people imbued with extra-natural properties, e.g. The rings, the silmarils, Galadriel's mirror etc.
However, I digress.
The fact remains that in the published canon, no there were no instances of wizards outside the five who came from the far west at the end of the second age.