The Quebec Expedition, or the Walker Expedition to Quebec, was a British attempt to attack Quebec in 1711 in Queen Anne's War, the North American theatre of the War of Spanish Succession. It failed when seven transports and one storeship were wrecked and some 850 soldiers drowned in one of the worst naval disasters in British history.

The expedition was planned by the administration of Robert Harley, chief minister of the crown, and was based on plans originally proposed in 1708. Harley decided to mount the expedition as part of a major shift in British military policy, emphasizing strength at sea. The expedition's leaders, Admiral Hovenden Walker and Brigadier-General John Hill, were chosen for their politics and connections to the crown, and its plans were kept secret even from the Admiralty. French agents were able to discover British intentions and warn authorities in Quebec.

The expedition expected to be fully provisioned in Boston, the capital of colonial Massachusetts, but the city was unprepared when it arrived, and Massachusetts authorities had to scramble to provide even three months' supplies. Admiral Walker also had difficulty acquiring experienced pilots and accurate charts for navigating the waters of the lower Saint Lawrence River. The expedition reached the Gulf of Saint Lawrence without incident, but foggy conditions, tricky currents, and strong winds combined to drive the fleet toward the north shore of the river near a place now called Pointe-aux-Anglais, where the ships were wrecked. Following the disaster, Walker abandoned the expedition's objectives and returned to England. Although the expedition was a failure, Harley continued to implement his "blue water" policy.