Super World Stadium '99 (スーパーワールドスタジアム'99, literally: Sūpā Wārudo Sutajiamu '99), is a baseball arcade game that was released by Namco in 1999 only in Japan; it runs on Namco System 12 hardware and is the twelfth entry in the company's long-running World Stadium series. It is also the fifth entry in the series that does not use a Yamaha YM-2151 FM sound chip for music (as with its four immediate predecessors, it uses a C352 custom sound chip for everything) and the second title in the series which features three-dimensional polygonal graphics (as well as non-identical-looking players).
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