Glossary of Pali & Buddhist Terms:Glossary that covers many Pali words and technical Buddhist terms.
A Glossary of Buddhist Terms: Glossary on a site about Chinese Buddhism.
Buddhism A to Z: Compiled by Ron Epstein, Ph.D.
Buddhism Glossary: On the website of a university Buddhist study and practise group.
Dharma Dictionary : Tibetan-English-Dictionary of Buddhist Teaching & Practice: An ongoing project involved in compiling Buddhist terminology and translation terms to bridge the Tibetan and English languages. Begun in 1979, it has slowly grown to a database of approx 5 megabytes with 65,000 entries.
Dukkha: An extensive discussion of "dukkha", a central term in Buddhism which is not directly translatable into English.
Glossary of Kadampa Buddhist Terms: Definitions of many commonly used Tibetan Buddhist terms.
Glossary of Pali Buddhist Terms: Pali words used in Buddhism.
Glossary of Shin Buddhist Terms: Glossary of Shin Buddhist terms, from The Collected Works of Shinran.
Glossary of Terms: Adapted from the "talk.religion.buddhism" FAQ.
Glossary of Zen Terms: A glossary of Zen as used by the Kwan Um School of Zen.
Interpretation of Buddhist Terminology: Essay on how Buddhist terms were translated into Chinese.
Sesshin Glossary: Definitions of terms used at Zen retreats.
Zen Dictionary: A Japanese Zen dictionary of over 150 commonly used terms.