Jack Lyons

• Jack Lyons (cricketer), Australian cricketer
• Jack Lyons (diver), Canadian diver
• Jack Lyons (financier), British entrepreneur and philanthropist
• Jack Lyons (footballer, born 1912), Australian rules footballer for Geelong
• Jack Lyons (footballer, born 1919), Australian rules footballer for Essendon and North Melbourne
• Jack Lyons (soccer), American soccer player
• Jack Lyons (unionist), American labor union leader
• J. B. Lyons, Irish medical historian and writer