Seminary in Sejny was founded few years after the establishment of the Diocese of Sejny. This article presents the role of its students at the process of regaining independence by Lithuania. During the study at the seminary prospective priests were forming their national identity, so that they could be involved into the process of formation awareness of their parishioners. Students at the seminary were committed to the distribution of printed materials in Lithuanian language that were forbidden. They also took part in activity of Lithuanian associations. Some clergymen were committed to the process of creation of political and economic basics of Lithuania’s independence. One of the representatives of the Diocese of Sejny (Augustów) was a member of Lithuanian authorities and had signed Act of Independence. Four priests were chosen to the Lithuanian parliament.