Silas Zephaniah Landes (May 15, 1842 – May 23, 1910) was a U.S. Representative from Illinois.

Born in Augusta County, Virginia, Landes attended the public schools.

In 1886, Landes appointed James R. Lindsay to the United States Military Academy; Lindsay graduated in 1890 and retired as a brigadier general.

He resumed the practice of law in Mount Carmel.

This article incorporates public domain material from the Biographical Directory of the United States Congress