This paper describes some of the pronunciation features of Thai speakers of English in New Zealand, based on the observation of Thai students during their language laboratory sessions in a pre-university English course. Regular pronunciation features and consistent patterns of sound replacement were observed, which seemed to be characteristic of, and contribute substantially to, the foreign accent of Thai speakers of English in New Zealand. By relating these features to the phonological system of Thai, it was found that interference in the form of differing phonetic representations of corresponding phonemes in English and Thai is a major source of pronunciation difficulty for Thai speakers of English. Equally significant are differences in distribution between phonemes in English and Thai. Thai problems with English stress and intonation are also discussed. Tabular displays of English and Thai phonemes as well as diagrams indicating Thai allophonic replacements for English phonemes are given. (Author/FWB)