Poison Ivy - Look-Alikes

Toothwort

Manitoba Maple (Acer negundo) (Box Elder)

Raspberry

Bladdernut (Staphylea trifolia) (resembles Poison Ivy only because they both have three leaves).

But Bladdernut has opposite leaves.

Fragrant Sumac (Rhus aromatica)
The leaves of this shrub are very aromatic when rubbed. But of course, by then it's too late if they aren't and you've just rubbed a Poison Ivy leaf! :)

Poison Sumac (Toxicodendron vernix)
It doesn't look like Poison Ivy, but the effects of touching it are the same.