Aso-Shimodajyō Station (阿蘇下田城駅, あそしもだじょうえき) is a railway station on the Minamiaso Railway Takamori Line in Minamiaso Village, Aso District, Kumamoto Prefecture, Japan.

[1] The station's former name (Aso Shimodajō Fureai Onsen) when written in kana has 16 characters, making it the fifth longest station name in Japan, along with Yanagawa Kibōnomori Kōen-mae Station on the Abukuma Express Line.

[3] The station is unmanned, and has a single platform with one track.

The station building has a castle-like appearance, reminiscent of Shimoda Castle, which was located in the vicinity during the Tensho era.

Aso-Shimodajō Station used to have a mineral-free, indoor onsen, but it was shut down in 2016 due to damage caused by the 2016 Kumamoto earthquake.