Emilija Vileišienė née Jasmantaitė (1861–1935) was a Lithuanian activist. Born to a noble family, she attended the Smolny Institute and lived with her older brother in Saint Petersburg and Caucasus. When her brother became severely ill, they moved to Vilnius (Wilno, Vilna) where Vileišienė met her husband Antanas Vileišis and became active in Lithuanian cultural life. She was an active member of various Lithuanian organizations, including the Lithuanian Mutual Relief Society of Vilnius, Society of Saint Zita for servants, cultural Rūta Society. During World War I, she was a board member of the and was particularly active in organizing relief for war refugees. After the war, she remained in Vilnius and continued active public life despite several arrests by the Polish government. In 1928–1