This exploratory study examined the efficacy of Conjoint Behavioral Consultation for addressing classroom disruptive behavior for middle school students with externalizing behavior problems. In addition, the parent-teacher relationship, parent and teacher competence in problem-solving, and acceptability were examined. Participants were parents and teachers of four middle school students with externalizing behavior problems. Disruptive classroom behavior data were examined in a concurrent multiple baseline across participants design. Parent-teacher relationship, competence in problem-solving, and acceptability data were examined descriptively. Findings suggested improvements in disruptive behavior for each participant. However, limitations impeded interpretations. Parent-teacher relationship data were inconclusive. Six out of eight parents and teachers with pretest and posttest data reported improvements in their competence in problem-solving. All parents and teachers perceived the consultation process favorably. Limitations and future directions are discussed.