§16§§This book constitutes the proceedings of the Third International Workshop on Dynamic Logic, DaLí 2019, held in Prague, Czech Republic in October 2020. Due to COVID-19 the workshop has been held online. §The 17 full papers presented together with 6 short papers were carefully reviewed and selected from 31 submissions.§§§The theoretical relevance and practical potential of dynamic logic is a topic of interest in a number of scientific venues, from wide-scope software engineering conferences to §04§Expedition in the Update Universe.- Thinking about Causation: A Causal Language with Epistemic Operators.- Awareness Logic: A Kripke-based Rendition of the Heifetz-Meier Schipper Model.- Dealing with Unreliable Agents in Dynamic Gossip Belief Based on Inconsistent Information.- Parameterized Complexity of Dynamic Belief Updates.- Default Modal Systems as Algebraic Updates.- Expressivity of Some Versions of APAL.- Constructive Dynamic Logic of Relation Changers.- Complexity of Commutative Infinitary Action Logic.- Grounding Awareness on Belief Bases.- Ecumenical Modal Logic.- Inquisitive Dynamic Epistemic Logic in a Non-Classical Setting.- Public Announcement Logic in HOL.- Bounded Multi-Agent Reasoning: Actualizing Distributed Knowledge.- Simpler Completeness Proofs for Modal Logics with Intersection.- Arbitrary Propositional Network Announcement Logic.
