Untitled, Steel sculpture in downtown Portland, United States.

Untitled is a 1977 steel and porcelain enamel sculpture by John Killmaster at Southwest 5th Avenue and Southwest Pine Street on the Portland Transit Mall. It measures about 5 feet 5 inches on each side, and its large enamel panels carry brightly colored abstract designs. Sybilla Avery Cook likened its bright crayon colors to a child's building set.

John Killmaster completed the steel and porcelain enamel work in 1977. TriMet and the United States Department of Transportation funded it, and since 2009 it has stood at Southwest 5th Avenue and Southwest Pine Street on the Portland Transit Mall. In December 1993 the Smithsonian's Save Outdoor Sculpture! program rated its condition as needing treatment.

The work belongs to the City of Portland and Multnomah County Public Art Collection, administered by the Regional Arts & Culture Council. It was funded by TriMet and the United States Department of Transportation, and since 2009 it has stood on the Portland Transit Mall at Southwest 5th Avenue and Southwest Pine Street.

The sculpture sits at a busy downtown intersection and works well as a landmark for visitors navigating the surrounding streets. It can be viewed from multiple angles since it stands in an open area without barriers, allowing people to walk around it freely.

The steel surfaces change how they look throughout the day as sunlight creates different reflections and shadow patterns on the metal. This means the sculpture appears visually different depending on when visitors stop by and what angle they view it from.