Daisy Systems Corporation, incorporated in 1981 in Mountain View, California, was a computer-aided engineering company, a pioneer in the electronic design automation (EDA) industry.

It was a manufacturer of computer hardware and software for EDA, including schematic capture, logic simulation, parameter extraction and other tools for printed circuit board design and semiconductor chip layout.

Daisy Systems was founded by Aryeh Finegold, David Stamm and Vinod Khosla; its original investors were Fred Adler and Oak Investment Partners.

Many notable people in the EDA industry once worked for Daisy Systems, including Harvey Jones, who became the CEO of Synopsys, and Vinod Khosla, who, a year later in 1982, co-founded Sun Microsystems.

Dave Millman and Rick Carlson founded EDAC (now ESD Alliance), the industry organization for EDA vendors.