Stephen Palfrey Webb (March 20, 1804 - September 29, 1879) was Mayor of Salem, Massachusetts for two nonconsecutive terms (1842-1845, 1860-1862) and Mayor of San Francisco (1854-1855). After finishing law school, he practiced law in Salem. Afterwards, he served in the Massachusetts State Legislature, first as a Representative and then as a Senator. He was then elected Salem's mayor, serving three years in his first term in that office.