Hyacinth Gulski (November 28, 1847 – December 24, 1911) was a pioneer Polish-American Roman Catholic priest.
Gulski was born in Chełmno, then part of West Prussia in 1847. In 1866 he joined the Franciscans and was ordained at Laki, German partition of Poland, entering the priesthood on September 21, 1873. That same year, his friary was closed as a result of the Kulturkampf. Gulski spent two years in hiding and eventually fled in 1875 via Antwerp to the United States, where he was offered a pastorship in Berlin, Wisconsin. The following year, he was transferred to St. Stanislaus Catholic Church in Milwaukee, Wisconsin, the principal Polish parish in the city.
Under Gulski's guidance, "St. Stan" grew; a new US$4000 pipe organ was added to the church and its spires covered in copper. During his pastorate, in 1882 a record 96 marriages were performed in the church. The church was now serving 400 families, an increase from the original 30. A new rectory was built that same year. Eventually, even this large church could no longer cope with the numbers wishing to attend mass.
Gulski left St. Stanislaus to organize the new St. Hyacinth parish, which was located just west of St. Stanislaus. Many were surprised by this move, as obviously St. Stanislaus was a prestigious posting for a priest. However, Father Gulski had a missionary zeal to build houses of worship for his beloved Polish community in Milwaukee. A location was chosen on West Becher and South 15th Streets to construct the new church with the support of Archbishop Michael Heiss. In addition, a school, hall, rectory, and convent were built on the site. Although not as elegant as St. Stanislaus, the parishioners felt the austere lines were conducive to prayer and meditation. The church, seated 800 worshipers, was blessed on April 1, 1883.