Bartholomew Voorsanger (born March 23, 1937) is an American architect.

Bartholomew (Bart) Voorsanger was born in Michigan and raised in San Francisco. He graduated with honors from Princeton University in 1960, and received his Masters in Architecture from Harvard University in 1964. He received a Doctor Honoris Causa from the University for Architecture and Urbanism “Ion Mincu” in Bucharest, Romania in 2005.

Beyond international and national recognition, the built public architecture of Bartholomew Voorsanger, such as the Garden Court at Pierpont Morgan Library (completed in 1994 - demolished 2001), as well as The Asia Society Museum overall and particularly its public space on the ground floor (completed in 2001), which represents a "fluid space where nature meets high tech"; have received steady acclaim from the general public.

The private character of his residential buildings includes an equally consistent obsession with capturing nature and light through carefully calibrated and restrained architectonic gestures, and bringing them inside his houses, wherever they may be: Colorado, Arizona, Virginia, California, or Dubai. This is done in the spirit of the true beginning of American painting, starting with Frederic Edwin Church's depiction of the landscape of the Americas.

The New York architect Voorsanger received a bachelor's degree with Honors from Princeton University, a master's degree in Architecture from Harvard University, and accepted in 2005 the title of Doctor Honoris Causa from the University of Architecture and Urbanism “Ion Mincu”, Bucharest, Romania. Prior to opening his practice, Voorsanger worked for three years with urban planner Vincent Ponte in Montreal, Quebec, Canada, followed by a decade as an Associate with I.M. Pei & Partners in New York.

The firm Voorsanger & Mills (est. 1978), was restructured as Voorsanger Architects PC in 1990, with Voorsanger as the Principal of the firm responsible for the design. Voorsanger’s architecture projects have been published widely both nationally and internationally, in volumes, magazines, and articles. Earlier projects include studies for New York University, such as Midtown Center (with Edward Mills), the Graduate and Undergraduate dormitories, and the Center for Advanced Digital Studies. Notable later projects include the International Competition for The Brooklyn Museum Master Plan, The Pierpont Morgan Library Garden Court, Eugenio Maria de Hostos Community College (with Hirsch Danois Architects), the Air Traffic Control Tower at LaGuardia, the Asia Society and Museum in New York, Terminal B at Newark International Airport, and the Master Plan for the University of Virginia Art Museum.

Among the notable residential projects, the firm has built are: Wildcat Ridge in Snowmass, Colorado, the Blue Ridge Residence in Charlottesville, villa in Tucson, villas and apartment complex in Dubai and just completed residence in the Napa Valley. A major public building, the National World War II Museum in New Orleans, was commissioned as a result of a competition. The first three phases (with Mathes Brierre Architects) have been completed and already open to the public; additional phases are still under construction. with additional phases under construction. In the new National Military Museum in Abu Dhabi of the United Arab Emirates design competition, Voorsanger's proposal has been selected.

The Firm’s projects have been recognized internationally, nationally, and locally through the numerous awards and exhibitions at prestigious museums and galleries, which include the Museum of Modern Art in New York, the Frankfurt Museum of Architecture, the Museum of Finnish Architecture, Ministerio de Obras Publicas Gallery in Madrid/Spain, the AA School of Architecture in London, Harvard University, the Hudson River Museum, the National Academy of Design, the AIA/NYC Center for Architecture, and New York University.