Lionni's illustrations have been compared to those of Eric Carle as both often employ animals, birds, insects, and other creatures to tell a story about what it is to be human.
Leo Tolstoy | Pope Leo XIII | Leo Gorcey | Leo Burnett | Leo Brouwer | Leo VI the Wise | Leo | Pope Leo X | Leo Durocher | Wadada Leo Smith | Ted Leo | Pope Leo I | Pope Leo IX | Melissa Leo | Leo Carrillo | Ted Leo and the Pharmacists | Leo Castelli | Leo Burnett Worldwide | San Leo | Leo Strauss | Leo Marks | Leo Laporte | Léo Ferré | Leó Szilárd | Leo Slezak | Leo Frobenius | Leo Cárdenas | Pope Leo XII | Leonardo Leo | Leo Fall |
In 2009, Putnam/Philomel published Artist To Artist: 23 Major Illustrators Talk to Children about Their Art, with contributors including Mitsumasa Anno, Quentin Blake, Carle, Tomie dePaola, Leo Lionni, Barry Moser, Robert Sabuda, Maurice Sendak and Rosemary Wells.