The Van Steenis Building of the University of Leiden, the Rubiaceae genus Steenisia, and the street Cornelis van Steenishof in Oegstgeest are named after him.
He died in De Steeg in Gelderland, near Arnhem, just a few weeks before Nazi rule ended, and he lies buried in the graveyard of the Reformed Church at 6 Haarlemmerstraatweg in Oegstgeest.