Casa Loma (Spanish for "Hill House") is a Gothic Revival style mansion and garden in midtown Toronto, Ontario, Canada, that is now a historic house museum and landmark. It was constructed from 1911 to 1914 as a residence for financier Sir Henry Pellatt. The architect was E. J. Lennox, who designed several other city landmarks. Casa Loma sits at an elevation of 140 metres (460 ft) above sea level.

Due to its unique architectural character in Toronto, Casa Loma has been a popular filming location for movies and television. It is also a popular venue for wedding ceremonies, and Casa Loma can be rented in the evenings after the museum closes to the public.

In 1903, financier Henry Pellatt purchased 25 lots from developers Kertland and Rolf. Pellatt commissioned architect E. J. Lennox to design Casa Loma, with construction beginning in 1911, starting with the massive stables, potting shed and Hunting Lodge (a.k.a. coach-house) a few hundred feet north of the main building. The Hunting Lodge is a two-storey 4,380-square-foot (407 m2) house with servants' quarters. As soon as the stable complex was completed, Pellatt sold his summer house in Scarborough to his son and moved to the Hunting Lodge. The stables were used as a construction site for the castle (and also served as the quarters for the male servants), with some of the machinery still remaining in the rooms under the stables.

The house cost about $3.5 million and took 300 workers three years to build. Due to the start of World War I, construction was halted. At 98 rooms covering 64,700 square feet (6,011 m2), it was the largest private residence in Canada.

Notable amenities included an elevator, an oven large enough to cook an ox, two vertical passages for pipe organs, a central vacuum, two secret passages in Pellatt's ground-floor office, a pool, and three bowling alleys in the basement (the last two were never completed).

Most of the third floor was left unfinished, and today serves as the Regimental Museum for The Queen's Own Rifles of Canada. Pellatt joined the Regiment as a Rifleman and rose through the ranks to become the Commanding Officer. He was knighted for his dedication to the Regiment. Pellatt later served as the Honorary Colonel and was promoted to Major-General upon retirement.

Sir Henry imported artisans from Europe to design much of the furniture and other features of the castle. Casa Loma has five acres of gardens. An underground tunnel connects Casa Loma to the Hunting Lodge and to the stables (garage, potting shed, stalls, carriage room and tack rooms).

Casa Loma is a popular location for use in film and television. It has served as a location for movies such as X-Men, Strange Brew, Chicago, The Tuxedo, Scott Pilgrim vs. the World, Warehouse 13, Descendants, Twitches Too, The Pacifier, and Titans where it stands in for Wayne Manor. Comic books and children's novels that have used it include the Scott Pilgrim series and Eric Wilson's murder mystery, The Lost Treasure of Casa Loma. It was also temporarily transformed into Hogwarts for the release of Harry Potter and the Deathly Hallows as well as The Beast's Castle for Disney's 2017 live action Beauty and The Beast. In the CBC Television show Being Erica, the episode "Mi Casa, Su Casa Loma" features Casa Loma prominently as the place where main character Erica Strange works.

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