The international students have to apply for a visa depending on their citizenship and the length of studies at Vilnius University.
Please note that details of the procedure for application for the residence permit/visa D might be changed by the time you decide to visit the country therefore we suggest to consult the nearest Lithuanian embassy before the arrival or internet:
Ministry of Foreign Affairs https://www.urm.lt/default/en/
Migration Department under the Ministry of the Interior of the Republic of Lithuania http://www.migracija.lt/
Note: It is the responsibility of individual students to present all required documents in a timely manner at the Migration Department to maintain a valid and legitimate visa (or residence permit) status throughout their study at VU.