Porta Westfalica is a town in the district of Minden-Lübbecke, in North Rhine-Westphalia, Germany.

The Emperor William Monument, near the town of Porta Westfalica in the North Rhine-Westphalian county of Minden-Lübbecke, is a colossal monument above the Weser gorge of Porta Westfalica, the "Gateway to Westphalia". It was erected to honour the first German Emperor, William I (1797–1888), by the then Prussian Province of Westphalia between 1892 and 1896 and emerged against the background of a rising German national identity. The monument, which is around 88 metres (289 ft) high, is classified as one of Germany's national monuments.