Although there are many different species of owls and all of them are different from the rest in some way or another, there are certain types of owls that have been known to mate for life. Screech owls and Great Horned Owls have both been known to find a mate and keep the same one for the rest of their lives. Barn Owls on the other hand do not mate for life.
Other than owls, there have been many species which have been studied and known to mate with the same partner for life. All owls have different mating habits though, but at least a few species have been known to mate for life.