Elisha Johnson (1785–1866) was an engineer and early resident of Rochester, New York.
Johnson moved to Rochester in 1817 and purchased 80 acres (320,000 m2) of land on the east bank of the Genesee River from Enos Stone.
Johnson became the mayor of Rochester in 1838 and came up with a plan for the construction of a water works through the village that was rejected by the Common Council.
At the end of his term Johnson became an engineer for the Genesee Valley Canal and moved to Portageville, New York, where he built the Hornby Lodge.
During the American Civil War, Union Army General William Sherman's soldiers destroyed the Tellico Iron Works, but Sherman acquitted Johnson for his part in supplying the Confederate Army because of Johnson's northern birth and sympathies.