Plena Manlibro de Esperanta Gramatiko (PMEG, English: Complete Manual of Esperanto Grammar) is a book which explains Esperanto grammar in an easy-to-learn format.

Examples of the terms used are "O-vorto" (O-word) instead of "substantivo" (noun, substantive) and "rolvorteto" (little role word) instead of "prepozicio" (preposition).

[5] PMEG is mainly a practical guide and not really a theoretical work for linguists, unlike the Plena Analiza Gramatiko (Complete Analytical Grammar), which was regarded as "the largest research project into Esperanto's grammar" until PMEG's publication.

[7] In 2005, a printed version, published by Esperanto-USA, was made available for purchase.

[8] Only Wennergren is responsible for PMEG's contents, but many other people helped with the making of this book.