Criminal justice system

• John Walker Lindh (born 1981), preferred to be called Johnny Walker, American convicted of working for the Taliban
• Johnny Walker, one of the Birmingham Six, six men falsely accused and imprisoned for two 1974 pub bombings in Birmingham, England, before being exculpated

Entertainment

• Johnnie Walker (DJ) (born 1945), British radio disc jockey
• Johnny Walker (actor) (1923–2003), Indian actor
• Johnny Walker (DJ) (1948–2004), America radio disc jockey, real name James Embry
• Johnny Walker, rock musician in the Soledad Brothers
• Johnnie Walker (actor born 1894) (1894–1949), American actor appeared in silent and sound films
• Johnny "Big Moose" Walker (1927–1999), American electric blues pianist and organist

Military

• Frederic John Walker (1896–1944), nicknamed "Johnnie" after the whisky, British anti-submarine ace during the Second World War
• John Anthony Walker (1937–2014), former US Navy Warrant Officer convicted of spying for the Soviets

Sports

• John "Johnny" Walker, American professional wrestler better known as Mr. Wrestling II
• Johnnie Walker (racing driver), Australian racing driver
• Johnny Walker (baseball) (1896–1976), American baseball infielder
• Johnny Walker (Australian footballer) (1908–1980), Australian rules footballer
• Johnny Walker (footballer, born 1928), Scottish professional footballer who played for Wolverhampton Wanderers, Southampton and Reading
• Johnny Walker (footballer, born 1973), Scottish professional footballer who played for Clydebank, G