Others
- John C. Curtis (1845–1917), American Civil War soldier and Medal of Honor recipient
- John Curtis (entomologist) (1791–1862), noted English entomologist
- John B. Curtis (1827–1897), inventor of the first chewing gum prototype
- John Curtis (games designer), designer of the Rolemaster game systems
- John Thomas Curtis (1913–1961), American botanist and plant ecologist
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