Suicidal behavior occurs among people living with HIV/AIDS.Thomas Joiner has postulated that in order to complete suicide three variables must be present-perceived burdensomeness and thwarted belongingness, and acquired capacity. We examined these three concepts in a partial test of Thomas Joiner's interpersonal-psychological theory of suicidal behavior. Our sample consisted of 52 individuals that were receiving services at HIV/AIDS clinics. These individuals were divided into two groups-one with suicidal behaviors, the other with no suicidal behaviors. Acquired capacity was limited to medication adherence and both groups reported good adherence with their medications. Results show those in the suicidal behavior group experience slightly more perceived burdensomeness and feelings of thwarted belongingness than those in the no suicidal behaviors group. These findings and suggestions for future research are presented.