  This volume contains a selection of papers presented at LFMTP 2020, the 15th
International Workshop on Logical Frameworks and Meta-Languages: Theory and
Practice (LFMTP), held the 29-30th of June, 2019, using the Zoom video
conferencing tool due to COVID restrictions. Officially the workshop was held
in Paris, France, and it was affiliated with IJCAR 2020, FSCD 2020 and many
other satellite events.
  Logical frameworks and meta-languages form a common substrate for
representing, implementing and reasoning about a wide variety of deductive
systems of interest in logic and computer science. Their design, implementation
and their use in reasoning tasks, ranging from the correctness of software to
the properties of formal systems, have been the focus of considerable research
over the last two decades. This workshop will bring together designers,
implementors and practitioners to discuss various aspects impinging on the
structure and utility of logical frameworks, including the treatment of
variable binding, inductive and co-inductive reasoning techniques and the
expressiveness and lucidity of the reasoning process.
