OASIS is a 5-item scale that asks individuals to rate the severity and impairment associated with past-week anxiety symptoms (e.g., "In the past week, when you have felt anxious, how intense or severe was your anxiety?") from 0 (little or none: Anxiety was absent or barely noticeable.) to 4 (extreme: Anxiety was overwhelming. It was impossible to relax at all. Physical symptoms were unbearable). Scores range from 0-20, with higher scores indicating greater anxiety and associated impairment in the past week.

SIDAS is a 5-item scale that assesses past-month frequency and controllability of suicidal thoughts, how close one has come to making an attempt, and distress and impairment associated with thoughts of suicide (e.g., "In the past month, how often have you had thoughts about suicide?"). Responses range from 0 (never or not at all) to 10 (always or extremely) on each item, with item 2 reverse scored. Scale scores range from 0-50, with higher scores indicating more (worse) suicidal ideation.

Internalized stigma was assessed us- ing the mean score on a three-item scale, the Lesbian, Gay, and Bisexual Identity Scale-Internalized Homonegativity Subscale, that asks individuals to rate thoughts and feelings related to their LGBTQ identity (e.g., "If it were possible, I would choose to be straight"). Responses range from 1 (disagree strongly) to 6 (agree strongly). Scores range from 3-18 with higher scores indicating higher internalized stigma.

Individuals assigned to waitlist will be put on a waitlist for 3 months after baseline assessment, after which they will also receive the same treatment as the therapy group.

Total of all reporting groups

Individuals assigned to therapy will receive 10 weekly individually-delivered sessions, directly after baseline assessment, that address minority stress mechanisms underlying SMW's depression, anxiety, and alcohol abuse.

EQuIP (Empowering Queer Identities in Psychotherapy): Individuals assigned to therapy will receive 10 weekly individually-delivered sessions, directly after baseline assessment, that address minority stress mechanisms underlying SMW's depression, anxiety, and alcohol abuse.

Individuals assigned to waitlist will be put on a waitlist for 3 months after baseline assessment, after which they will also receive the same treatment as the therapy group.

The Global Severity Index of the 18-item BSI provides a mean score across depression, anxiety, and somatization subscales, and assesses psychological distress (e.g., "feeling nervousness or shakiness inside") on a 5-point scale from 0 (not at all) to 4 (extremely) for the past 7 days. Scores range from 0-72, with higher scores indicating worse outcomes (greater symptoms severity).

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

Alcohol use will be measured using the Short Index of Problems for Alcohol (SIP-A). The SIP-A is a 15-item, binary response (yes/no) measure that has a range of scores from 0-15. The highest score of 15 is an indicator of the greatest amount of alcohol use related problems.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

ODSIS is a 5-item scale that asks individuals to rate the severity and impairment associated with past-week symptoms of depression (e.g., "In the past week, when you have felt depressed, how intense or severe was your depression?) from 0 (little or none: Depression was absent or barely noticeable.) to 4 (extreme: Depression was overwhelming.). Scores range from 0-20, with higher scores indicating greater depression and associated impairment in the past week.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

OASIS is a 5-item scale that asks individuals to rate the severity and impairment associated with past-week anxiety symptoms (e.g., "In the past week, when you have felt anxious, how intense or severe was your anxiety?") from 0 (little or none: Anxiety was absent or barely noticeable.) to 4 (extreme: Anxiety was overwhelming. It was impossible to relax at all. Physical symptoms were unbearable). Scores range from 0-20, with higher scores indicating greater anxiety and associated impairment in the past week.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

SIDAS is a 5-item scale that assesses past-month frequency and controllability of suicidal thoughts, how close one has come to making an attempt, and distress and impairment associated with thoughts of suicide (e.g., "In the past month, how often have you had thoughts about suicide?"). Responses range from 0 (never or not at all) to 10 (always or extremely) on each item, with item 2 reverse scored. Scale scores range from 0-50, with higher scores indicating more (worse) suicidal ideation.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

Internalized stigma was assessed us- ing the mean score on a three-item scale, the Lesbian, Gay, and Bisexual Identity Scale-Internalized Homonegativity Subscale, that asks individuals to rate thoughts and feelings related to their LGBTQ identity (e.g., "If it were possible, I would choose to be straight"). Responses range from 1 (disagree strongly) to 6 (agree strongly). Scores range from 3-18 with higher scores indicating higher internalized stigma.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

The Sexual Minority Women Rejection Sensitivity Scale asks participants to rate 16 vignettes in terms of how concerned or anxious each would make them about being rejected because of their sexual orientation, and their likelihood of attributing the rejection to their sexual orientation. For example, one item states, "You are on a date with a woman at a restaurant. Your waiter provides you and your date with poor service." Responses to the anxiety and likelihood stems range from 1 (very unconcerned/very unlikely) to 7 (very concerned/very likely). Total score is the sum of the products of anxiety and likelihood scores for all items. We adapted the scale to indicate "woman, gender nonconforming, or non-binary partner" and "heterosexual, cisgender" as relevant. Scale scores range from 16-112, with higher scores indicating higher rejection sensitivity.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

In the Sexual Orientation Concealment Scale, participants rate the degree to which they have disclosed their sexual orientation on a scale from 1 (out to none) to 4 (out to all). The total score is the mean of responses in the following domains: "family," "LGBTQ friends," "straight, cisgender friends," "co- workers", and "health care providers." Scores range from 1-4 with higher scores indicating lower sexual orientation concealment.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

In the Difficulties in Emotion Regulation Scale-Short Form (DERS- SF), an 18-item scale, individuals are asked how much each statement regarding emotion regulation (e.g., "When I'm upset, I acknowledge my emotions") applies to them from 1 (almost never) to 5 (almost always). Scores range from 18-90 with higher scores indicating greater difficulties in emotion regulation.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

The mean score on the Multidimensional Scale of Perceived Social Support (MSPSS), a 12-item scale, indicates the perceived support that individuals report receiving from family (e.g., "My family really tries to help me"), friends (e.g., "I have friends with whom I can share my joys and sorrows"), and significant others (e.g., "I have a special person who is a real source of comfort to me") on a scale ranging from 0 (very strongly disagree) to 7 (very strongly agree). Scores range from 0-72 with higher scores indicating greater perceived social support.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

The sum of the five items on the Ruminative Responses Scale- Brooding Subscale (RRS) indicates the frequency with which participants experience brooding thoughts in response to depressed mood (e.g., "Think 'what am I doing to deserve this?'") along a scale ranging from 1 (almost never) to 4 (almost always). Scores range from 5-20 with higher scores indicating greater rumination.

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

The Simple Rathus Assertiveness Schedule-Short Form (SRAS-SF), a 19-item scale, asks individuals to rate the personal typicality of assertive and unassertive behavior (e.g., "I find it embarrassing to return merchandise," "I have avoided asking questions for fear of sounding stupid") along a scale from 1 (very uncharacteristic of me) to 6 (very characteristic of me), for a summed total score.

Scores range from 19-114 with higher scores indicating greater unassertiveness (scale was reverse-scored).

Participants in the Therapy started therapy immediately after randomization, and therefore, have no data for the three-month waiting period prior to receiving the intervention. Participants in this arm started therapy three months after randomization (waitlist) and therefore, were not assessed at the three-month follow-up time point due to completion of the study.

Individuals assigned to waitlist will be put on a waitlist for 3 months after randomization, after which they will also receive the same treatment as the therapy group.