Lewis Linn McArthur (March 18, 1843 – May 10, 1897) was known as an American newspaper publisher, attorney, and state judge in Oregon.

His son Clifton Nesmith McArthur also became an attorney and served in the United States Congress.

His second son, Lewis A. McArthur, was the first editor of the Oregon Geographic Names publications.

[2] He transferred and completed his degree at Brown University in Providence, Rhode Island.

[1] In Rhode Island he passed the bar in 1864; he moved to Oregon to set up a practice in the developing state.

[2] From 1890 until his death, Lewis Linn McArthur practiced law in Portland, Oregon.