István Molnár

István Molnár can refer to:


 * István Molnár (chess player) (1933-2015), Hungarian chess player
 * István Molnár (painter) (1968-1993), Hungarian painter
 * István Molnár (volleyball) (1937-1999), Hungarian volleyball player
 * István Molnár (water polo) (1913-1983), Hungarian water polo player