First Church in Boston is a historic Unitarian church located in the Back Bay neighborhood of Boston, Massachusetts. Founded in 1807, it has played a significant role in the development of Unitarianism in the United States. The church is known for its beautiful architecture, particularly its striking steeple and stained glass windows. The church has been a center for social justice and community engagement throughout its history. It has hosted various notable figures, including Ralph Waldo Emerson and Henry David Thoreau, who were influential in the Transcendentalist movement. Today, First Church continues to serve its congregation and the wider community through various programs and initiatives.