Agnes Tachyon

Thoroughbred racehorse infobox
horsename = Agnes Tachyon


caption =
sire = Sunday Silence
grandsire = Halo
dam = Agnes Flora
damsire = Royal Ski
sex = Stallion
foaled = 1998
country = Japan flagicon|Japan
colour = Chestnut
breeder = Shadai Farm
owner = Takao Watanabe
trainer = Hiroyuki Nagahama
record = 4: 4-0-0
earnings = ¥222,082,000
race = Satsuki Sho (2001)
awards=
honours =
updated= July 11, 2007

Agnes Tachyon (Japanese : アグネスタキオン, April 13, 1998 - ) was a Japanese Thoroughbred racehorse sired by Sunday Silence.

Agnes Tachyon's dam Agnes Flora won the Oka Sho (Japanese 1000 Guineas) and his granddam Agnes Lady won the Yushun Himba (Japanese Oaks). Agnes Flora also produced the Tokyo Yushun (Japanese Derby) winner Agnes Flight.

Agnes Tachyon was undefeated in four starts including Satsuki Sho (Japanese 2000 Guineas), before a bowed tendon ended his racing career.

He is now a successful sire in Japan.

; Major Racing Wins
* 2001 Satsuki Sho (Japanese 2000 Guineas) (Domestic GI)
* 2001 Yayoi Sho (Domestic GII)
* 2000 Radio Tampa Hai Sansai Stakes (Domestic GIII)