Parent child interaction therapy (PCIT) is an evidence-based family intervention for young children with disruptive behavior. Parents and children who complete PCIT show greater immediate and long-term treatment gains than those who discontinue treatment prematurely. PCIT is a time- and effort-intensive treatment, and parents ambivalent about its value for their child or their ability to master the treatment skills may discontinue treatment before engaging sufficiently to experience change. Motivational interviewing (MI) is a client-centered therapeutic method of increasing motivation for change through the resolution of ambivalence. This paper describes how clinicians may incorporate NIT strategies into PCIT to enhance parental motivation when signs of ambivalence arise. Vignettes and scripted therapy exchanges illustrate use of the strategies to decrease ambivalence in PCIT, improve homework adherence, increase parenting self-efficacy, and reduce attrition, thereby improving outcomes for young children with disruptive behaviors and their families.