Racine Reef Light, Historical lighthouse in Lake Michigan near Racine, United States.

Racine Reef Light was a lighthouse on a concrete pier about two miles east of Racine, Wisconsin. The pier supported a three-story octagonal brick house with a central tower holding a fourth-order Fresnel lens. The house was demolished in 1961 and replaced by a steel skeleton tower on the same foundation.

A can buoy marked the reef from 1869, but it proved ineffective. An acetylene beacon on a masonry platform was lit on 31 August 1899, and after a $75,000 appropriation in 1903, a three-story octagonal brick house with a central tower was built on a concrete pier completed in 1905. The house was demolished in 1961 and replaced by a steel tower.

The preserved lens from the original equipment is now on display at the Racine Heritage Museum, where visitors can see it directly. It shows how ships were once guided across the water using light.

The light stands about 3 km east of Racine harbor, reachable only by boat; the present steel skeleton tower is automated and not open to visitors. The reef itself is a major hazard for traffic between Milwaukee and Chicago, so keep clear of the rip-rap dumped around the pier. The diaphone foghorn sounds a 2-second blast every 15 seconds when needed, April to November.

The iron package freighter Merchant ran aground on Racine Reef in 1875, one of the incidents that made the reef notorious among Milwaukee–Chicago traffic. The Fresnel lens from the 1905 tower survives at the Racine Heritage Museum, while the reef itself is now marked by a 15 m steel skeleton tower.