Behavior analysts have long emphasized the importance of collaboration, yet little empirical research has explored its impact across disciplines. This systematic review aimed to evaluate the outcomes of interdisciplinary collaboration in applied behavior analysis (ABA). Following Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines (Page et al., 2021), a search of PsycInfo (March 2024) yielded 12 articles meeting inclusion criteria (i.e., published between 2000 and 2024, written/available in English, experimental, included collaboration in an applied/human service provision between a Board Certified Behavior Analyst (BCBA) and a professional from another discipline, and published in a peer reviewed journal). Studies were excluded if they were reviews or summaries, or if the collaboration was between a behavior analytic professional and a parent/caregiver. Results, synthesized narratively, focused on describing the collaborative experiences of professionals, building skills and reducing challenging behaviors of clients through collaborative treatment, and increasing the collaborative skill set of professionals or graduate students. While findings were largely positive, few studies addressed maintenance, generalization, or quality indicators (social validity, interobserver agreement, or procedural fidelity). Future research should refine methods for teaching collaboration and include rigorous evaluations of collaborative models.