In Turkish Civil Law, paternity between the child and his/her father can be established by a judge's judgment as a result of a lawsuit filed by the mother or the child, in addition to marriage with the mother and recognition. This lawsuit is called "paternity lawsuit" and the judge's judgment is called "paternity judgment". In our study, the legal nature of the paternity lawsuit and the paternity judgment will be examined, the parties, possible plaintiffs and possible defendants will be discussed, the burden of proof in the lawsuit and how the proof will be carried out, the time period for filing the lawsuit, the competent and authorized court will be discussed, and finally, the consequences of the judge's judgment for the mother and the child will be tried to be determined.