Ruhl is a surname. Notable people with the surname include:

• Ludwig Sigismund Ruhl [de] (1794–1887), German painter
• William Ruhl (1901 – 1956), American character actor
• Dave Ruhl (1920–1988), Canadian professional wrestler
• Donald J. Ruhl (1923–1945), American Marine; awarded Medal of Honor for action at Iwo Jima
• Henry Ruhl (1909–1945), American murderer; executed in Wyoming
• J. B. Ruhl (fl. 2006), American legal academic specializing in environmental law
• Sarah Ruhl (born 1974), American playwright

Middle name:

• Henry Ruhl Guss (1825-1907), Union Army brevet Major General