This randomized controlled pilot study will evaluate the feasibility and preliminary efficacy of MBRP plus usual community treatment as usual (TAU) compared to TAU alone (TAU) for women with substance use disorders(SUD) and PTSD enrolled in community substance abuse treatment. Participants will be randomized to eight weekly 90-minute, mixed individual and group-based MBRP in addition to TAU or TAU alone. The eight sessions of MBRP will replace 8 sessions of seeking safety (SS); a trauma focused integrated therapy currently implemented in TAU. Outcomes assessed will be: