Lewis Findlay Watson (April 14, 1819 – August 25, 1890) was a Republican member of the U.S. House of Representatives from Pennsylvania.

Lewis Findlay Watson was born in Crawford County, Pennsylvania.

He attended the common schools and engaged in mercantile pursuits at Titusville, Pennsylvania in 1832.

Finally, he was elected to the Fifty-first Congress and served until his death in Washington, D.C., in 1890.

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