The Ambassador Bridge (officially the Ambassador International Bridge) is a suspension bridge that connects Detroit, Michigan, in the United States, with Windsor, Ontario, Canada. It is the busiest international border crossing in North America in terms of trade volume: more than 25 percent of all merchandise trade between the United States and Canada crosses the toll bridge. A 2004 Border Transportation Partnership study showed that 150,000 jobs in the region and US$13 billion in annual production depend on the Detroit–Windsor international border crossing.

The bridge is owned by Grosse Pointe billionaire Manuel Moroun through the Detroit International Bridge Company in the United States and the Canadian Transit Company in Canada. In 1979, when the previous owners of the bridge put it on the New York Stock Exchange and shares were traded, Moroun was able to buy shares, eventually acquiring the bridge. The bridge carries 60 to 70 percent of commercial truck traffic in the region. Moroun also owns the Ammex Detroit Duty Free Stores at both the bridge and the tunnel.

A new bridge, the Gordie Howe International Bridge, proposed by the Detroit River International Crossing (DRIC) commission, has been approved for construction by the Canadian and United States governments. The new bridge will be a government-owned and -operated crossing further downriver between Detroit and Windsor.

The bridge over the Detroit River had the longest suspended central span in the world when it was completed in 1929—1,850 feet (560 m). This was a record until the George Washington Bridge opened between New York and New Jersey in 1931. The bridge's total length is 7,500 feet (2,286 m). Construction began in 1927 and was completed in 1929. The architect was the McClintic-Marshall Company of Pittsburgh, Pennsylvania.

The four-lane bridge carries more than 10,000 commercial vehicles on a typical weekday. The Gateway Project, a major redesign of the U.S. plaza completed in July 2009, provides direct access to Interstate 96 (I-96) and I-75 on the American side and Highway 3 on the Canadian side. The Canadian end of the bridge connects to busy city streets in downtown Windsor, leading to congestion.

The privately owned bridge carries approximately 25% of trade between Canada and the United States.

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