Siavash Mirshams Shahshahani (Persian: سیاوش میرشمس شهشهانی) (born 1942) is an Iranian mathematician. He is a professor of mathematics and head of Mathematical Sciences Department at Sharif University of Technology. He headed up the IRNIC registry for the .ir ccTLD until his retirement from that position in late 2008. He has also served as a director of APTLD (the Asia Pacific Top Level Domain Association) between 2007 and his retirement from that position in February 2009.

Shahshahani completed his PhD under the supervision of Stephen Smale at the University of California at Berkeley in 1969. He has since devoted a substantial part of his career to mathematical education.

• Shahshahani, Siavash. An Introductory Course on Differentiable Manifolds. USA: Dover Publications.
• Shahshahani, Siavash. Differential and Integral Calculus Volume I (in Persian). Iran: Fatemi Publishing House.
• Shahshahani, Siavash. Differential and Integral Calculus Volume II (in Persian). Iran: Fatemi Publishing House.

• Siavash Shahshahani Homepage at Mathematics Department of Sharif University of Technology
• Siavash Shahshahani at the Mathematics Genealogy Project
• Siavash Shahshahani at ICANNWiki
• APTLD homepage

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