Define "intelligent life"
Based on definitions acceptable to most scientists, there may be at least 5 intelligent species on Earth (humans count as 1). You have to be careful how you limit the definition (for example, to exclude the other 4) because you might end up excluding a large proportion of the human race.
We do not know if life exists on any other planet. However, given the way chemistry works (for ex., the non-random way in which elements assemble to form molecules), life should be easy to come about, given the right conditions.
Will this life evolve into "intelligent" species? We don't know. The only example we have is our own planet and it is hard to say if our planet is extraordinarely special, or if it is just one of a gazillion average planets.
Also, of the 5 intelligent species, only one (humans) is presently capable of communicating with other planets -- if we ever found someone to communicate with.
Therfore, the answer to your question is "We don't know".
We certainly have not found any. But that does not prove it cannot exist.