Lesbian, gay, bisexual, and transgender (LGBT) people are included - but often invisible - in many evaluations. In light of increased federal attention to LGBT-specific data collection and the growing awareness of disparities faced by this population, evaluators must be prepared to consider how programs and policies affect LGBT people. However, evaluators are often at a loss for the best ways to ask about sexual orientation. Furthermore, we may inadvertently ask questions about gender in ways that marginalize transgender people, making them invisible to researchers and service providers. This skill-building workshop provided best practices for assessing sexual orientation and gender identity in youth and adult populations. Cutting-edge research on item development was shared, giving participants concrete ways to ask questions, and ways to make their evaluations more inclusive of sexual minorities.