Sir Howard Douglas Hall is the name of one of the buildings on the campus of the University of New Brunswick in Fredericton. The building is also known by its former name, Old Arts Building. It is the oldest and still operating academic building in Canada.

In 1825, John Woolford's project, for which the author received £ 25, was chosen for construction. The submitted plans were changed during construction, which began in 1826: the dome and balustrade were replaced with a simpler pediment.

The building was completed in 1827 and named after Sir Howard Douglas, Lieutenant Governor of New Brunswick. The lobby of the building today has an atmosphere of a museum: historical documents and objects that record the history of the university are stored there; the spacious corridors are also filled with history and portraits of former university rectors.

The building received the status of the National Historic Landmark of Canada in 1951. Besides, the university has another building with the same status: the astronomical observatory named after William Bridon Jack, professor of mathematics and natural philosophy at King's College which later became part of the University of New Brunswick.

On January 1, 1829, the building of King's College was officially opened by Lieutenant-Governor Sir Howard Douglas. There was a chapel, dining room, library, classroom, and office on the first floor. Student apartments were located on the second floor. Maid rooms, kitchen, and laundry were in the basement.

In 1876-77, the building got the third floor. It replaced the original roof with the current attic floor.

One of the most interesting parts of Sir Howard Douglas Hall is the Edwin Jacob Chapel. There are preserved wooden benches with carved names and dates of many generations of graduates. And if many educational institutions would regard this as vandalism or just got rid of the benches, the university treats them as a souvenir: the earliest names and dates date back to the late 1800s. Also, the chapel has stained glass windows created by the famous Canadian artist Molly Bobac.

Today, Sir Howard Douglas Hall houses the university's administration, the secretariat, and the admissions committee.