Inclusion Criteria:  Be able to bill insurance for individual psychotherapy at CHA; Be a current patient of CHA primary care, behavioral health care or CHA MINDWell; Have a current diagnosis of PTSD OR a CAT-MH PTSD score >58; Have sufficient English fluency and literacy skills to understand the consent process, procedures and questionnaires and have the ability to provide written informed consent; Have access to the internet and an electronic device with adequate data capacity; to complete questionnaires online and attend online videoconference groups; Must be available and willing to attend the scheduled online group sessions for 16 weeks; and must be available and willing to complete the online computerized assessments and phone interviews.  Exclusion Criteria:  Inability to complete an informed consent assessment AND/OR inability to complete baseline study assessment procedures (due to cognitive deficit, non-proficiency in English literacy, or any other reason); Current participation in another experimental research study; Expected medical hospitalization in six months from the date of enrollment; Expected incarceration in six months from the date of enrollment; Individuals who are pregnant with a due date within 26 weeks after study consent; Insufficient level of severity of PTSD symptoms: CAPS-5 SEV2 Total score less than 26; PTSD score of less than 31 on the PTSD Checklist for DSM-V (PCL-5)8 at screening visit; Inability to participate safely in the study intervention and without disrupting the group (in the opinion of principal investigator OR meeting any of the following criteria): Past year history of a psychotic disorder or clinician confirmed active psychosis (Severe level of psychosis on PSY-S-CAT > 30 will trigger the requirement of a clinical assessment prior to participation in the program) Bipolar I disorder history or severe level of mania on CAT-MH5 (>70) Acute suicidality or self-injurious behavior Severe depression, indicated by CAT-DI > 755,65 Acute homicidality with plan and/or intent; Hospitalization for suicide attempt or self-harm within three months of the enrollment period; Severe Borderline Personality Disorder or other severe personality disorder that may lead to disruptions within the group; and/or Moderate or severe Substance Use Disorder. In addition, use of or positive toxicology for illicit drugs (e.g., cocaine, opioids, etc.) or non-prescribed controlled medications (i.e., opioids, stimulants, or benzodiazepines) in the past 3 months.