This study evaluated the effects of alcohol-focused spouse involvement and behavioral couples therapy (BCT) in group drinking reduction treatment for male problem drinkers. Sixty-four male clients and their female partners were randomly assigned to 1 of 3 conditions: treatment for problem drinkers only (PDO), couples alcohol-focused treatment, or the latter combined with BCT. Clients whose partners were included in treatment evidenced fewer heavy drinking days and more abstinent/light drinking days in the year following treatment, relative to PDO clients. The combination of alcohol-focused spouse involvement and BCT yielded no better outcomes than alcohol-focused spouse involvement alone. Drinking consequences, spouse behavioral support for drinking reduction, and relationship satisfaction showed no effects of treatment condition.