The supervisory working alliance (SWA) is an element of the supervisory relationship (SR) and has also been found to be related to the therapeutic alliance (TA; DePue, Lambie, Liu, & Gonzalez, 2016). As the TA has a well-established relationship with client outcomes (Leibert, Smith, & Agaskar, 2011), the SWA should also be related to client outcomes as it works through the TA (Bambling, King, Raue, Schweitzer, & Lambert, 2006). No researchers have examined how the SWA and TA between therapists, supervisors, and clients may work together to predict client outcomes using dyadic data analysis, strong client outcome measures, and client perspectives of the TA. The authors examined the contribution of the TA between novice therapists (n = 155) and their clients (n = 193) on client outcomes, as well as the contribution of the supervisees' SWA scores on their client outcomes. Data was matched between therapist/supervisees and clients, and 2 structural equation models were developed to investigate the hypothesized contribution of the TA and SWA on client outcome. Results identified that the strength of the SWA and TA have direct effects on client outcomes, and the effect of the SWA on client outcomes is not mediated by the TA when clients' ratings of TA are used. The SWA is both directly and indirectly related to client outcome, when considering client and therapist ratings of the TA.