Konstantinas Olšauskas (1867–1933) was a Lithuanian Roman Catholic priest active in public life and convicted of murder in 1929. After graduating from the Saint Petersburg Roman Catholic Theological Academy in 1892, he was assigned as chaplain to the Liepāja Gymnasium and parish priest in Debeikiai and Rozalimas where he joined Lithuanian cultural life and helped distribute the banned Lithuanian books. In 1904, on the eve of the Russian Revolution of 1905, he was transferred to the Holy Cross Church, Kaunas. In Kaunas, Olšauskas organized the Workers' Society of St. Joseph as a counterbalance for various socialist organizations. He became long-term chairman of the that was organized in 1906 to establish and maintain Lithuanian schools in the Kovno Governorate. For three months in 1911, Ol