Holy Trinity Cathedral is the seat of the Church of Pakistan, Diocese of Karachi, situated on Fatima Jinnah Road, near Zainab Market, in Karachi, Pakistan. The current Bishop is The Rt. Rev. Sadiq Daniel. The Cathedral close also houses the Church of Pakistan's St Thomas' Theological College, Rev. Pervaiz Sultan, Principal. 
Established in 1844 and built in 1855, Holy Trinity Cathedral was designed by Captain John Hill of the Bombay Engineers and built from local, buff-colored Gizri stone as the first major church in Karachi. Its original tall tower was built to serve as a light house for ships arriving at Karachi Harbour but two stories of the tower were removed for safety in 1905. The original pitched roof was replaced by a barrel vaulted roof in the 1970s. As a former garrison church for the British military, the church has a number of plauques memorializing British servicemen and history.