This dictionary by P.M. Ryan, one of New Zealand's leading Maori-language scholars, is the most comprehensive and up-to-date available.

Contains over 50,000 concise entries divided into Maori-English and English-Maori sections.
Includes all the words most commonly used by fluent Maori speakers.
Features a vocabulary list with words for new inventions, metric terms, modern concepts and scientific, computer, technological and legal terms.
Incorporates an easy-to-use guide to the pronunciation of Maori and a section on Maori grammar.
Includes separate lists giving Maori translations of seasons, months, days of the week, points of the compass, parts of the body, New Zealand and overseas place names, and personal names.
Contains a Maori proverbs section, complete with translations and interpretations, and a map of tribal areas.

The Raupo Dictionary of Modern Maori- a modern classic.