voditelj

1. (on tv and radio) host; presenter
   Voditelj je postavio gostu neprijatno pitanje. — The host asked the guest an awkward question.
   On je voditelj jutarnjeg programa. — He's the host of the morning show.
2. (of a course, workshop, training) leader; facilitator; head
   Voditelj radionice je podelio učesnike u grupe. — The workshop leader divided the participants into groups.

The feminine form is voditeljka. For business roles Serbian usually uses rukovodilac or menadžer (rukovodilac projekta, menadžer projekta); voditelj projekta is typical of Croatian usage.