Harmony (ハーモニー Hāmonī) was an official magazine/newsletter distributed internally to Sega employees in Japan in the 1990's. The issues were distributed fairly irregularly; some issues were distributed on a monthly schedule while others issues' releases were two months apart.

Little is known about the magazine, but many of the front covers feature original illustrations based on the Sonic the Hedgehog series, created internally at Sega specifically for this magazine. These illustrations would later be seen by the public on Japanese trading cards and eventually in Sonic Jam and Sonic the Hedgehog The Screen Saver.

Harmony (ハーモニー) was an official magazine/newsletter distributed internally to Sega employees in Japan. It was not distributed regularly - sometimes the gap between an issue was a month, other times two months, presumably depending on what the company was doing at the time.

Little is known about Harmony, however a situation arose where many pieces of cover artwork, created internally at Sega specifically for this magazine, made their way into Sonic Jam and later Sonic the Hedgehog The Screen Saver. It is thought the magazine began at some point in the late 1960s / early 1970s and ended in 1998