The 25th New York Infantry Regiment, the "Union Rangers", was an infantry regiment that served in the Union Army during the American Civil War.

The regiment was organized in New York City, New York, on May 10, 1861, and was mustered in for a two-year enlistment on June 28, 1861.

The regiment was mustered out of service on June 26, 1863, and those men who had signed three year enlistments were transferred to the 44th New York.

The regiment suffered 7 officers and 54 enlisted men who were killed in action or mortally wounded and 4 officers and 25 enlisted men who died of disease, for a total of 90 fatalities.

This article about a specific military unit of the American Civil War is a stub.