Topkapı (meaning "Cannon Gate" in Turkish) is a neighbourhood in the municipality and district of Fatih, Istanbul Province, Turkey.

[2] Topkapı lies in the west end of Fatih district, under the ancient city walls.

Topkapı is so named because it was the site at which the Ottoman cannon known as "The Basilic" was deployed during the siege of 1453, against the St Romanus gate in the city walls.

The gate was the point at which Sultan Mehmed II entered the city after it fell.

Topkapı was the site of Istanbul's main bus station, which lay outside the city wall, until 1994 when it was moved to Bayrampaşa.