The founding of St. Stanislaus Parish in New Haven bears eloquent testimony to the faith and dogged patriotism of the first Polish immigrant to New Haven. Despite the difficulties of adjusting to their new surroundings, language and customs, they left behind a beautiful church so that subsequent generations of parishioners could come together as a people of God.

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The parish had its beginnings on February 2, 1896 when the Polish immigrants from the city of New Haven came together to form the St. Stanislaus Society. This society became the nucleus for the future St. Stanislaus Parish. Initially the group gathered for Mass at the German St. Boniface Church in New Haven, but in 1900 they began to make plans for a location of their own. A delegation from the St. Stanislaus Society petitioned Most Reverend Michael Tierney of the Hartford Diocese for permission to organize a parish. Bishop Tierney agreed and appointed Reverent Stanislaus Musiel to be pastor of the rising parish on September 12, 1900.

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Father Musiel celebrated the first Mass at St. Boniface Germania Hall on Wooster Street on September 16. A year later, on December 28, 1901, the parish was officially founded and the pastor purchased a home and grocery store on Dwight Street and had it converted to a chapel.

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On January 1, 1904, the Bishop entrusted the new parish to the Polish Vincentian Fathers and Reverend George Glogowski, CM, became the pastor. The Vincentians began their stewardship of the parish by offering a popular mission. The mission was a great spiritual experience for those who attended. The mission also revealed that the number of Polish immigrants in New Haven was far greater than expected. Their original chapel on Dwight Street would not be adequate to accommodate the numbers.

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The pastor, Father Glogowski, bought an old Swedish Lutheran church with two houses on St. John Street. The church was large enough to accommodate the growing numbers of parishioners but it also supplied a rectory for the priests. The church was renovated and a steeple was added. Most Reverend Michael Tierney, Bishop of Hartford, dedicated the church on October 23, 1904 and placed it under the patronage of St. Stanislaus. In 1907 Reverend Anthony Mazurkiewicz, CM, became pastor. During his years as pastor, Father Mazurkiewicz eliminated the parish debt and opened a parochial school for the parish children in the basement of the Church, run by the Sisters of the Holy Family of Nazareth.

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The parish continued to grow very rapidly and by 1910 it was evident that they had outgrown both the church and the parish school. Father Mazurkiewicz began to look for a property that would be more centrally located in the city of New Haven. He found an abandoned church on the corner of State and Eld Streets, the present location of St. Stanislaus Parish. By 1911, the property was cleared and the foundation for the present church was laid. On Decoration Day in 1912, Most Reverent John Joseph Nilan, Bishop of Hartford, blessed the cornerstone of the new church. Just a year later, on April 27, 1913, the first Mass was said in the new church. A solemn Mass of dedication was celebrated by Bishop Nilan on May 30, 1913.

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The parochial school was moved to the basement of the church where it remained for the next nine years. The parish also quickly acquired the adjacent lots and properties. In 1921, the parish demolished three houses on State Street in order to build a new school. It was completed in 1929.  In 1993, St. Stanislaus School merged with St. Michael School. Both closed in 1995. 

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The interior of the church has changed over the years. In 1925, the pastor, Reverend Joseph Janowski, CM, commissioned artist P. Mazur to paint the many frescoes on the interior of the church. Stained glass windows from Aachen, Germany were installed in 1926. In 1942 the pastor, Reverend Karol Pacherski, CM, commissioned Vincent Murdo of New Haven to beautify the interior of the church. “The Christianization of Poland in the 10th Century,” was chosen as the theme. The renovations were completed in 1943. A blessing for the redecorated church was held on October 11, 1943. In 1972, the original organ was rebuilt. Because the second Vatican Council had called for Mass to now be said facing the people of God, a new altar was installed. The rendition of the Last Supper was moved from the high altar to the front of the new Vatican II altar. The last major renovation in the church took place in anticipation of the 100 year anniversary of the parish by then pastor, Reverend Waclaw Hlond, CM. On April 25, 1979, the New Haven Preservation Trust proclaimed the church building noteworthy for its distinguished interior.

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In 2021, the Archdiocesan plan for the city of New Haven called for diocesan priests to serve at St. Stanislaus and the seven other churches in New Haven. The Vincentian Fathers currently still serve at other parishes in Connecticut and New York.