Clarion Alley, Mural alley in the Mission District, San Francisco, US

Clarion Alley is a narrow passageway between Mission and Valencia Streets completely covered with murals featuring bold colors and striking designs. The artwork addresses themes of justice, civil rights, and community concerns that residents hold dear.

Originally called Cedar Lane, the alley was renamed Clarion Alley around the turn of the twentieth century. The Clarion Alley Mural Project began in 1992, when residents including Rigo 23 and Aaron Noble painted murals on the alley walls; Noble and Rigo's "Superhero Warehouse" showed dejected superheroes on the side of the 47 Clarion warehouse. That warehouse, the former Woodmen Building and an IWW meeting hall, was demolished in 2001 and replaced by a parking lot.

Local and international artists constantly update the murals to reflect current community concerns and social movements that matter to Mission District residents. The artwork addresses themes of justice and human rights through visual storytelling that residents and visitors encounter daily.

Clarion Alley runs east–west between Mission and Valencia Streets, one block south of 17th Street and one block north of 18th Street. The lane is narrow and paved, with murals on both walls, so walk it on foot and step aside for residents' doorways and garages. The 16th Street Mission BART station is a short walk away.

The warehouse at 47 Clarion, once the Woodmen Building with its main door at 3345 17th Street, served as an IWW meeting hall where Tom Mooney tried to organize railway workers. Later home to composer Terry Riley, The Cockettes and artists Rigo 23 and Aaron Noble, it was demolished in 2001 and replaced by a parking lot for a condominium project, becoming a symbol of gentrification.