Beth Angell's research interests focus on service delivery to individuals with serious mental illness. 

Much of her work focuses on how treatment adherence problems are addressed in mental health practice, especially in the area of mandated treatments such as involuntary outpatient commitment. She also studies how the quality of treatment relationships shapes both service utilization and treatment outcomes among those with co-occurring problems (e.g., substance use, homelessness, and criminal justice issues). 

Other research she has conducted addresses communication practices in mental health care, including shared decision-making related to psychiatric medication; problems of stigma and social isolation among people with mental illness; and training programs aimed at improving how police officers respond to people with mental illness in the community.