Louisbourg Lighthouse, Federal heritage lighthouse in Cape Breton, Canada

Louisbourg Lighthouse is an octagonal concrete tower rising 17 meters above the coastline with a white exterior. It reaches a focal height of 32 meters above sea level and operates automatically to guide vessels safely into the harbor.

The first lighthouse at this site was built in 1734 and marked the beginning of lighthouse operations in Canada. The current structure dates to 1923 and represents a later replacement for earlier towers that guided ships for generations.

Lighthouse Point was a gun-battery position in both the 1745 Siege of Louisbourg and the 1758 Final Siege: once captured, it let attackers bombard the fortress. The first tower's stone ruins remain at the site, and Parks Canada plaques mark the earlier structures.

The tower was destaffed in 1990 and now runs automatically, showing one white flash every 10 seconds from a focal height of 32 metres. The site is also the start of the Louisbourg Lighthouse Trail, a coastal walking route opened in 2008, and interpretive plaques mark the ruins of the earlier towers.

The first tower, begun in 1730 and finished in 1734, was Canada's first lighthouse; its stone ruins are still visible at the site. The wooden 1842 tower burned in 1922, and Parks Canada archaeologists have excavated and stabilized its foundation. The present 1923 concrete tower is a twin of the Georges Island Lighthouse in Halifax.