The goal of this study was to examine the links among attachment, child temperament, and the quality and frequency of mother-toddler conflict. Sixty-four mothers and children took part in a series of laboratory tasks when the child was 30 months of age and an audio-recorded home observation when the child was 36 months of age. All episodes of conflict were identified from the videotapes/audiotapes, transcribed, and coded for conflict strategies, resolution, and themes. Mothers also completed measures of attachment security and child temperament. Concurrent attachment security was related to the quality of mother-toddler conflict (including resolution, justification, and compromise) at both periods but not to the frequency of conflict. In addition, aspects of child temperament (i.e., negative reactivity and activity level/impulsivity) were related to both the quality and the frequency of mother-toddler conflict.