Fortinet, Inc. is an American cybersecurity company headquartered in Sunnyvale, California, who develop and market security solutions like firewalls, endpoint security and intrusion detection systems.

Fortinet has offices all over the world in US, Canada, Chile, Mexico, Argentina, Brazil, Algeria, Austria, Belgium, Denmar, Czech Republic, Finland, France, Germany, Greece, Hungary, Ireland, Israel, Italy, Norway, Poland, Qatar, Romania, Saudi Arabia, Spain, Sweden, Switzerland, Netherlands, UK, Turkey, UAE, Australia, China, Hong Kong, India, Indonesia, Japan, Korea, Malaysia, Philippines, Singapore, Taiwan, Thailand, and Vietnam.

Founded in 2000 by brothers Ken Xie and Michael Xie, the company's first and main product was FortiGate, a physical firewall. The company later added wireless access points, sandbox and messaging security. The company went public in November 2009.