Endometriosis is a common cause of pelvic pain in women which has been historically under-studied and under-diagnosed. The goal of this research is to pilot-test the feasibility and acceptability of a manualized, single-session brief mindfulness-based intervention (BMBI) among participants with endometriosis-related chronic pelvic pain (ECPP) who undergo surgical treatment, and gather preliminary data necessary for future studies assessing BMBI's impact on outcomes in surgically-treated ECPP. This pilot study will enroll 10-20 adult participants with ECPP to receive either a BMBI adjunctive to treatment as usual (TAU; n=5-10) or education with TAU (n=5-10) prior to their ECPP surgery. The central hypothesis is the BMBI is feasible to deliver pre-operatively, acceptable to patients, and may help improve acute post-surgical outcomes through more adaptive stress coping and pain processing, enabled by mindfulness training.