A B S T R A C T Academic entrepreneurial opportunities are a key factor in the development of new spin-offs. This study examines the relationship between academic entrepreneurial opportunities perceived by academics and these academics' entrepreneurial self-efficacy (ESE) to determine which dimensions of ESE (among management, innovation, marketing, risk-taking and financial control) are significantly related to these opportunities. It also analyses how industrial and entrepreneurial networks,

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... s part of the university's entrepreneurial ecosystem, influence this relationship. A quantitative method is used to achieve this goal, developing a structural equations model and applying partial least squares technique to analyse a sample of 388 Spanish academics. The results show that the dimensions of ESE related to variables such as management, innovation and marketing have a positive and significant relationship to perception of entrepreneurial opportunities. This situation is different, however, for dimensions such as risk-taking and financial control. Moreover, the findings show that entrepreneurial and industrial networks have a significant effect on this relationship.