Redwood is a hamlet and census-designated place (CDP) in Jefferson County, New York, United States.

Redwood is located on New York State Route 37 at the junction of County Roads 3 and 192.

Former Democratic U.S. Representative John Cosgrove, who served Missouri's 6th Congressional District, was born near Alexandria Bay and attended school in Redwood, NY.

The racial makeup of the CDP was 98.63% White, 0.68% African American, and 0.68% from two or more races.

Out of the total population, 27.3% of those under the age of 18 and 3.1% of those 65 and older were living below the poverty line.