This book constitutes the refereed proceedings of the 21 st International Conference on Practical Aspects of Declarative Languages, PADL 2019, held in Lisbon, Portugal, in January 2019. The 14 revised full papers were carefully reviewed and selected from 35 submissions. The papers present original work emphasizing novel applications and implementation techniques for all forms of declarative concepts, including logic, constraint, and functional languages.

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Strong Equivalence and Program's Structure in Arguing Essential Equivalence between First-Order Logic Programs.- Automatic Program Rewriting in Non-Ground Answer Set Programs.- Personalized Course Schedule Planning using Answer Set Programming.- An ASP-based Approach to Representing and Querying Textual Knowledge.- Natural Language Generation From Ontologies.- Improving Residuation in Declarative Programs.- Incremental Evaluation of Lattice-Based Aggregates in Logic Programming Using Modular TCLP.- A Combinatorial Testing Framework for Intuitionistic Propositional Theorem Provers.- Faster Coroutine Pipelines: A Reconstruction.- Classes of Arbitrary Kind.- Distributed Protocol Combinators.- Composing Syntactical Constructs to Create Domain-Specific Languages.- Proof Carrying Plans.- Static Partitioning of Spreadsheets for Parallel Execution.