The Bar Harbor Express was a seasonal passenger train which served the resort areas around Bar Harbor, Maine, in the United States. It was a joint venture of the New York, New Haven and Hartford Railroad, the Maine Central Railroad and the Boston and Maine Railroad (B&M).

The New York, New Haven and Hartford Railroad, commonly known as The Consolidated, or simply as the New Haven, was a railroad that operated principally in the New England region of the United States from 1872 to December 31, 1968. Founded by the merger of the New York and New Haven and Hartford and New Haven railroads, the company had near-total dominance of railroad traffic in Southern New England for the first half of the 20th century.