Objectives: This study was an anonymous Internet survey of individuals currently diagnosed with borderline personality disorder (BPD), where participants gave opinions about BPD criteria in the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition - Text Revision (DSM-IV-TR), and suggested modifications for BPD criteria to appear in the DSM-V (5th edition). Methods: Survey links were posted on 24 websites/Internet blogs that offered advice, education, or treatment of BPD. Demographic and clinical data pertaining to each participant were collected. Free-text responses were analyzed by frequencies of keywords and key phrases. Results: A total of 1,832 responses were downloaded between March 7 and June 6, 2009, and 646 responses were analyzable. Results indicated that the majority of the DSM-IV-TR criteria appeared to capture what participants were experiencing, even though a significant percentage of participants felt that something was missing from the current criteria. A significant percentage of participants felt that BPD should be renamed in the DSM-V; some combination of "emotion(al)" and "(dys)regulation" was most commonly suggested to include in an alternative name. Conclusions: This Internet study highlighted the enthusiasm of individuals diagnosed with BPD to share their opinions on the DSM criteria with mental-health professionals. A significant percentage of participants in this study felt that BPD should be renamed in the DSM-V. Patient involvement during the DSM-V revision process remains controversial.