The iriver H100 series (originally iHP-100 series) is a series of discontinued portable digital audio players (DAP) made by iriver company and originally released in October 2003. The models in the H100 series differ mainly in hard drive storage capacity. The players were succeeded by the iriver H300 series.

It is possible to upgrade the firmware on H100 series players. These upgrades generally contain bug fixes and new features. The latest official version of the H100 series firmware is V1.66.

The H100 series is equipped with a 1.8 inch (45 mm) form factor hard drive manufactured by Toshiba. Storage density has increased since their introduction, making it possible for users to replace the factory drives with higher capacity aftermarket models. Opening the case of the player voids the warranty. However, after the case has been opened the upgrade consists of simply unplugging the old drive and inserting the new one.

As of December 2005, the H120 can be upgraded with a 30GB single-platter drive (giving a 50% storage increase) and the H140 can be upgraded with an 60GB double-platter drive (giving a 50% storage increase). Due to differing physical sizes, the two drive types cannot be used interchangeably (i.e. a double-platter drive will not fit in an H120 casing).