Guaranty Building, Bank building on Hollywood Boulevard, Los Angeles, United States.

The Guaranty Building is a twelve-story reinforced concrete office block at 6331 Hollywood Boulevard, designed by John C. Austin and Frederic M. Ashley in a Beaux-Arts style with Neo-Renaissance and Classical Revival traits. Its facade is divided into three horizontal sections: the lower three floors are sheathed in terra cotta and grey granite, with two massive Corinthian engaged columns framing a recessed entrance bay; the fourth to tenth floors are faced in light-colored brick with paired sash windows in the central bay; the top two floors carry stone columns and a heavy roofline cornice. Brass and bronze metalwork runs across the exterior, and the lobby has marble floors and walls with brass elevator doors in a quilted pattern.

The Guaranty Building was built in 1923 by the Guaranty Building and Loan Association on land bought from Hollywood's first Methodist church for $2,000 per front foot. Its investors included Charlie Chaplin and Cecil B. DeMille, and architects John C. Austin and Frederic M. Ashley designed it. The association went bankrupt in 1930; Allstate Title Company moved in the next year. It joined the National Register of Historic Places in 1979.

The building's ground floor holds the L. Ron Hubbard Life Exhibition, which visitors can enter. Inside Scientology the structure is called the Hollywood Guaranty Building, or HGB, and it serves as corporate office for Church of Scientology International and the Religious Technology Center, housing most of the organization's upper and middle management.

The building sits at 6331 Hollywood Boulevard near Ivar Avenue and is easy to reach on foot from nearby metro and street entrances. It forms part of a walking route connecting several historical structures across the neighborhood.

The building's name changed with its owners: after the Guaranty Building and Loan Association went bankrupt in 1930, it became the Allstate Title Building, and since 1988 it has been the Church of Scientology's Hollywood Guaranty Building, or HGB, housing the L. Ron Hubbard Life Exhibition on the ground floor.