Carl Olof Axel Ljungstedt (October 20, 1865 - September 15, 1949) was a Swedish-born American surveyor and civil engineer. He was born in Stockholm; Nothing is known of his childhood or education, but by 1892 he was employed by the USGS as a draftsman, having been appointed to the service in Missouri. He was naturalized a citizen of the United States on December 21, 1895,The 1910 census had Ljungstedt living in Bethesda, Maryland with his wife and adopted son; he was by this time employed by the U.S. Geological Survey. He produced a 1922 'Shaded relief map of Virginia' for the Virginia Geological Survey, as well as USGS maps of West Virginia, Pennsylvania, Montana, and the Geological Map of the United States. He died in Rockport, Maine in 1949.