Social workers and paraprofessionals serve psychiatric populations at high risk for suicide, but may receive little training related to suicidality. This study evaluated a suicide awareness and prevention training workshop for providers working with mentally ill homeless and previously homeless adults. Trainees attended a half day of training, and completed knowledge posttests and training evaluations. Half the trainees completed knowledge pretests, and those onsite at 21 months completed follow-up knowledge tests. Both professionals and paraprofessionals showed substantially improved knowledge at posttest and follow-up. Trainees also reported high levels of satisfaction with training format and content. (Contains 1 table.)