Lewis McKenzie (October 7, 1810 – June 28, 1895) was a nineteenth-century politician, merchant and railroad president from Virginia.

Born in Alexandria, District of Columbia, McKenzie pursued an academic course as a young adult and prominently engaged in shipping and mercantile pursuits, founding and becoming president of the Alexandria, Loudoun and Hampshire Railroad.

He was civically minded and began his political career as a Whig and was a member of the Alexandria County common council from 1843-1850 during which time he instigated the final push for retrocession in 1846.

At various times he was the presiding justice of the magistrate court and a Brigadier General of the town's militia.

This article about a member of the United States House of Representatives from Virginia is a stub.