The IBM 3800 is a discontinued laser printer designed and manufactured by IBM. It was the first commercially available laser printer. It was a continuous form laser printer, meaning that it printed onto a continuous long sheet of paper.

The 3800 was initially positioned as a line printer replacement with additional features. Besides the much greater speed, enhancements over the line printer included:

Later the 3800 family supported Advanced Function Presentation (AFP), a page description language with features similar to Xerox Corporation's Interpress or Adobe Systems' PostScript.

The 3800 attached to a mainframe system via a parallel (Bus and Tag) channel. Support for two channels was available as an option.

At the time of the announcement of the IBM 3900, a ComputerWorld Magazine article claimed there were over 10,000 IBM 3800s deployed worldwide.

The 3800 was replaced by the IBM 3900, announced in 1990. The 3800 was discontinued in 1999.

Development began in 1969 using a project code name of Jubilee. Later, the code name was changed to Argonaut. IBM did not however have a xerographic printer to base the Jubilee on (all IBM printers up to this point were mechanical printers, e.g., chain, print bar, train). This meant prototyping used an IBM Copier I, which was not capable of anywhere near the product goal of 1 million pages per month. Therefore, dramatic developments were required in areas such as: paper path handling, lasers and optics, toner fusion and control electronics.

The IBM 3800 was developed and initially manufactured in San Jose, California.