We examine a tenuous and intriguing suggestion emerging from qualitative research into passion that entrepreneurs experience venture-related obsession. Responding to this observation, we develop an understanding of obsession in entrepreneurship and clinical and non-clinical populations. We propose that entrepreneurs may experience venture-related obsessions that are similar to obsession as described in the clinical literature and develop a model of entrepreneurial obsession. We suggest that obsession may have a relationship with passion and contribute productively towards desirable entrepreneurial outcomes despite its potential to stimulate negative affect or anxiety. Further research is warranted to explore and define this construct.