title: Mary Sinclair (disambiguation)
text: # Mary Sinclair (disambiguation)
  
  Mary Sinclair (1922–2000) was an American actress
  
  Mary Sinclair may refer to:
  
  * Mary P. Sinclair (1918–2011), American environmental activist
  * Mary Craig Sinclair (1882–1961), writer and the wife of Upton Sinclair
  * Mary Emily Sinclair (1878–1955), American mathematician
  * May Sinclair, pseudonym of Mary Amelia St. Clair (1863–1946), a popular British writer
  