Siemon is both a surname and a masculine given name, a variant of Simon. People with the name include:
Surname Gustav Siemon (1918–2011), German politician Jeff Siemon (1950–2026), former professional American football player Uwe Siemon-Netto (1936–2025), German international columnist
Given name Siemon Allen, South African contemporary artist Siemon Muller (1900–1970), American paleontologist and geologist