Taher Elgamal[a] (Arabic: طاهر الجمل) (born 18 August 1955) is an Egyptian and American cryptographer and entrepreneur.

Although he came to the United States to pursue a PhD in Electrical Engineering at Stanford University, he said that "cryptography was the most beautiful use of math he'd ever seen".

He served as chief scientist at Netscape Communications from 1995 to 1998,[7] where he was a driving force behind Secure Sockets Layer.

After helping Securify spin out from Kroll-O'Gara,[13] Taher served as the company's chief technology officer (CTO) from 2001 to 2004.

[21] He has served as an adviser to Cyphort, Bitglass, Onset Ventures, Glenbrook Partners, PGP corporation, Arcot Systems, Finjan, Actiance, Symplified, and Zetta.