Roy J. Nielsen (November 9, 1886 – August 12, 1964) served in the California State Assembly and Senate.

Nielsen served in the 14th, 11th, 8th and 9th Assembly districts and served in the 19th Senate district.

[1] From 1942 to 1952, he served as Sacramento City Council.

During World War I he also served in the United States Army.

This article about a California politician is a stub.