St Augustine's Tower stands in St John's Church Gardens, in central Hackney, in the London Borough of Hackney, just off the southern end of the Narrow Way (formerly Church Street). It is all that remains of the early 16th century parish church of Hackney of St Augustine, which replaced the 13th century medieval church founded by the Knights of St John. The Tower comprises four stages beneath a restored parapet with diagonal buttressing. A fine working 16th century turret clock has remained on the third floor of the Tower since at least 1608. The Tower and contents are Grade I listed.