This volume contains the papers which have been accepted for
presentation atthe Third International Symposium on
Programming Language Implementation andLogic Programming
(PLILP '91) held in Passau, Germany, August 26-28, 1991. The
aim of the symposium was to explore new declarative
concepts, methods and techniques relevant for the
implementation of all kinds of programming languages,
whether algorithmic or declarative ones. The intention was
to gather researchers from the fields of algorithmic
programming languages as well as logic, functional and
object-oriented programming. This volume contains the two
invited talks given at the symposium by H. Ait-Kaci and
D.B. MacQueen, 32 selected papers, and abstracts of several
system demonstrations. The proceedings of PLILP '88 and
PLILP '90 are available as Lecture Notes in Computer Science
Volumes 348 and 456.