Walter Warder (April 7, 1851 – August 17, 1938) was an American lawyer and politician from Illinois.

In 1880, Warder moved with his wife and family to Cairo, Illinois, where he continued to practice law.

In 1883, Warder served as state's attorney and master-in-chancery for Alexander County, Illinois.

During the Spanish American War, Warder helped raise a provisional regiment for the United States Army and was commissioned a major.

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