Our pilot randomized controlled trial (RCT) of mindfulness meditation (MM), a popular mind-body modality, demonstrated its potential to safely improve the health of patients and reduce opioid dosage in opioid-treated CLBP. To expand the evidence for MM for use in opioid-treated chronic pain, the Investigators propose a 5-year multi-site, mixed-methods pragmatic RCT comparing the effectiveness of MM to standard-of-care cognitive behavioral therapy (CBT) for improving outcomes in opioid-treated CLBP. The study team will follow 766 participants over 12 months and compare outcomes that matter to patients and their families in 383 adults randomized to the MM group to 383 adults randomized to the CBT group, controlling for relevant factors.