Mount Royal Cross, Summit cross in Mount Royal Park, Montreal, Canada

The Mount Royal Cross is a steel monument at the northeastern summit of Mount Royal. Its lattice shaft rises 31.4 metres, with arms spanning 11 metres, and rests on a tapered base of four angled legs braced by diagonal and horizontal bars. A small railed platform wraps around the shaft below the arms, and the structure is held together by 6,000 rivets.

Paul Chomedey de Maisonneuve, founder of Ville-Marie, erected a wooden cross on Mount Royal in 1643 to fulfil a vow to the Virgin Mary after praying for an end to a devastating flood. In 1874 the Société Saint-Jean-Baptiste proposed a new cross for the mountain; the project was realised fifty years later, when 104,200 volunteers sold commemorative stamps at five cents each and raised $10,000. Construction began on 16 May 1924 to plans by Sulpician priest Pierre Dupaigne, with the steel structure built by Dominion Bridge, and the cross was first lit on Christmas Eve 1924.

The cross lighting shifts in color depending on what is being celebrated in the city. People passing by notice these color changes marking holidays, mourning, and local traditions.

The cross stands at the northeastern summit of Mount Royal, in Mount Royal Park. Since the 2007–2009 restoration, a new base designed by architect Luce Lafontaine lets visitors walk up to and even through the monument, which a fence had previously prevented. The surrounding paths and park furniture were also reworked.

A plaque beside the cross marks a time capsule buried in 1992 for Montreal's 350th birthday. It holds messages and drawings from 12,000 children imagining the city in 2142, and is set to be opened for the 500th anniversary.