A new and distinct sweet orange clone, ‘OLL-4’ was produced via embryonic callus (tissue culture) from an original tree selection (‘OLL’) from an abandoned USDA field trial. ‘OLL-4’ produces easy-to-peel, round oranges with excellent internal and external color. Trees of ‘OLL-4’ exhibit improved cold and drought tolerance over industry standard oranges, and do not seem to exhibit alternate bearing.