This volume has been curated from two sources:  presentations from the  Conference on Rings and Polynomials , Technische Universität Graz, Graz, Austria, July 19 -24, 2021, and papers intended for presentation at the  Fourth International Meeting on Integer-valued Polynomials and Related Topics , CIRM, Luminy, France, which was cancelled due to the pandemic. The collection ranges widely over the algebraic, number theoretic and topological aspects of rings, algebras and polynomials. Two areas of particular note are topological methods in ring theory, and integer valued polynomials. The book is dedicated to the memory of Paul-Jean Cahen, a coauthor or research collaborator with some of the conference participants and a friend to many of the others. This collection contains a memorial article about Paul-Jean Cahen, written by his longtime research collaborator and coauthor Jean-Luc Chabert.