István Plattkó also known as Esteban Platko (4 May 1883 – 16 November 1966) was a Hungarian football player and manager who coached Real Valladolid, Granada, Atlético Baleares and Mallorca in Spain. His brothers were Ferenc Plattkó and Károly Plattkó.
Plattkó spent much of his coaching career in the Balearic Islands with Constància, Binissalem and Atlético Baleares before he died in Palma de Mallorca, Spain.