The Barra Strait Bridge is a Canadian road bridge crossing the Barra Strait of Bras d'Or Lake, carrying Nova Scotia Route 223 between Iona, Victoria County, on the West side, and Grand Narrows, Cape Breton County (Cape Breton Regional Municipality) on the east side.

The bridge incorporates a double leaf bascule section at its eastern end to permit the continued passage of marine traffic through the strait.

A ferry service operated across the Barra Strait, between Grand Narrows and Iona, starting in 1847, and continued for the next 146 years.

On 21 April 1979, in a public meeting held in Iona, the then Premier of Nova Scotia, John Buchanan announced that a permanent crossing over the Barra Strait would be built, to be completed within four years.

[8] The bridge incorporates a double leaf bascule section at its eastern end to permit the continued passage of marine traffic through the strait.

Maritime Steel and Foundry had to have the girder design reviewed by Whitman Benn & Associates as well as two other independent consultants.

[12] Maritime Steel also had the strengthening measures, designed by Whitman Ben, checked by another independent consultant before submitting them to the Department or Transportation for its review and approval.

During the placement of the deck the top elevation of steel box girders appeared to be too high in the area of Pier One in Span 2.

[12] Whitmen Benn reviewed the screed elevations and provided solutions to remedy the problems, to the Transportation Department.

The extra weight of concrete in the haunches raised concern regarding the effect on the steel structure from the additional load.

[12] In December 1992 Whitman Benn undertook the task of reviewing the design of the superstructure with the added weight of this concrete and outlined their findings and recommendations for strengthening the structure in a report to Maritime Steel.

[13][14] The final cost of the bridge was $34.8 million, which included the two approaches, the superstructure, an overpass over the rail lines, and paving.

In July 1916 the Zealandia broke her tow during a gale and sank after crashing into the Barra Strait railway bridge.

[18] In late June 2020 the Nova Scotia Department of Transportation and Infrastructure Renewal announced that due to mechanical problems, the bridge was inoperable for marine traffic.