John Bower Lewis, QC (March 18, 1817 – January 24, 1874) was the second mayor of Bytown in 1848, the first mayor of Ottawa from 1855 to 1857, and a member of the 2nd Canadian Parliament from 1872 to 1873.

He studied law in Toronto, was admitted to the bar in 1839, and became a Queen's Counsel in 1867.

In 1872, he was elected to the House of Commons as a Conservative in the two-member riding of Ottawa City but resigned in 1873 due to the Pacific Scandal.

He died in Ottawa in 1874; he was the city solicitor and was also campaigning for reelection to the House of Commons at the time of his death.

There is a John Bower Lewis and family fonds at Library and Archives Canada.