The objective of this paper is to explore empirical evidence of industrial clustering, learning and innovative capacities in the electronics and software industry, including similarities and differences between them, in the Tehran metropolitan region. A comparison of survey results from this metropolitan region with the industrial cluster literature shows some degree of industrial clustering as evidenced by the high labor inter-firm mobility and the formation of a labor market, together with a relatively high spin-off activity from existing firms, and relatively strong horizontal relationships. However, in both clusters, there is weak evidence of local institutional thickness. The results of these findings have a number of implications for our understanding of the clustering potential of the electronics and software industrial clusters in the Tehran metropolitan region. In general, the results suggest how the sampled industrial clusters have generated some clustering advantages and how important systemic linkages with other actors really are. JEL Classification: R11, O14, O18