Systime Computers Ltd was a British computer manufacturer and systems integrator of the 1970s and 1980s. During the late 1970s and early 1980s, Systime became the second-largest British manufacturer of computers, specializing in the minicomputer market.

The company was based in Leeds, England, and founded in 1973. Its success was based on selling systems built around OEM components from Digital Equipment Corporation (DEC), and it grew to have over 1,300 employees with turnover peaking around £60 million. Systime was unusual among systems integrators in that it actually manufactured the hardware it sold to customers.

A portion of Systime was purchased in 1983 by Control Data Corporation and the company's founder departed. Systime Computers then went through a period of sharp decline, in part due to lawsuits from DEC for intellectual property infringement, and even more so due to charges of violating Cold War-era U.S. export restrictions regarding indirect sales to Eastern Bloc countries.

In 1985, what was left of Systime was fully acquired by Control Data Corporation, and a year later the DEC-related services part of that subsidiary was bought by DEC. Systime then focused on selling products built by its own engineers. The Systime–Control Data arrangement did not prosper, and in 1989 Control Data split Systime into four companies, each sold to a management buyout.

John Gow was a mechanical engineering graduate of the University of Leeds who had gone into computer programming and then became a software support manager at a Lancashire office of the British subsidiary of Digital Equipment Corporation (DEC). He also did some hardware sales work and realised that few of the customers to whom he was selling actually understood the capabilities of the computers they were buying. In 1972, Gow, then 27 years old, and three others set up a partnership on their own, labouring in Gow's bungalow workshop.

Systime Computers Ltd was created the following year, being incorporated in October 1973. Gow and the three others moved their work into the canteen of an abandoned mill in Leeds.

Due to inadequate capitalisation – £2,800, in a field in which the minicomputers they would be selling cost £60,000 each – the new company had a shaky start and came close to going under right away. The key turning point was engaging with Leeds-based jukebox firm Musichire, which had purchased a computer from DEC but were struggling with it. Systime came in on a consulting basis and sold Musichire both software and new hardware. John Parkinson, financial director of Musichire, was sufficiently impressed with Gow's sales abilities that, in 1974, Musichire took a financial stake in Systime. Parkinson subsequently became chair of the board of directors of Systime.

Gow emphasized that Systime would provide not just hardware but also software applications, systems engineering, and support. By 1975, Systime had £2.75 million in turnover and profits of £300,000 and was already opening offices and subsidiaries overseas.