Baseline demographic data are lacking for most tropical forest birds, particularly from undisturbed habitats. During the 2003 breeding season, we documented the productivity of Abbott's Babbler (Malacocincla abbotti), a sedentary insectivorous passerine, on a 30-ha permanent forest plot in northeastern Thailand. We found 17 active nests of 13 breeding pairs, for which the Mayfield estimate for overall nesting success was 0.36 ± 0.13 SE. Breeding started in mid-January, a month earlier than previously recorded. Despite a relatively long period of post-fledging parental care, at least five pairs were double-brooded.