Otakadoyayama Transmitter (おおたかどや山標準電波送信所, otakadoyayama-hyoujyundenpa-soushinjyo) is an LF-time signal transmitter at Tamura-City, Fukushima-ken, Japan used for transmitting the time signal JJY on 40 kHz. The Otakadoyama site is one of two JJY transmitters, another is the Haganeyama site.