The Rialto Theatre is a performance theater and concert venue located on Congress Street in downtown Tucson, Pima County, southern Arizona.

During its run as an adult theater, there were several incidents of attempted arson, purportedly stemming from one offended local woman; she succeeded at one point in burning the balcony stairs in 1978, and was never caught.

Quickly the Rialto garnered a reputation as Tucson's preeminent music venue, as Bear and Schoonover hosted over 700 shows featuring a diverse range of acts such as The Black Crowes, Linkin Park, The White Stripes, Maroon 5, Dave Chappelle, Morrissey, Fugazi, Government Mule, Sam Butera, The Afro-Cuban Allstars, King Sunny Ade, Cesaria Evora, Arturo Sandoval, Dwight Yoakam, Merle Haggard, The Vagina Monologues, Quest for Fire and even the Jim Rose Side Show.

The Rialto Theatre Foundation was founded in April 2004 by Tucson Weekly co-founder Douglas Biggers, who spearheaded the acquisition by the city and was the executive director of the project from mid-2004 until December 2011.

During his tenure, the Rialto Theatre was listed on the National Register of Historic Places, more than $2 million in renovation and equipment improvements were made, and the theater was completely re-branded and re-launched in April 2005.

Since its latest revitalization in 2004, the theater still boasts some of its original historic interior with a nod to an Art Nouveau motif, along with new and much-needed air conditioners.

Primarily holding music concerts from all genres, The Rialto hosts other shows and events as well, from dance, performance, and occasional film screenings.