Hiroko（ヒロコ）は日本の歌手。作詞家、作曲家。mihimaru GTのボーカリストとして2003年にデビュー。兵庫県出身。 血液型O型。 10年の活動を経て2013年に無期限活動休止。8年の休養期間を経て、2021年より活動を再開。自身が様々なジャンルの音楽に触れて育ったことから、ジャンルレスなJ-Pop Music Artistを目指し活動している。 
 In 2003, hiroko and composer miyake formed “mihimaru GT” based on the concept of “hip hop meets pop,” and debuted in July of 2003. 
 In 2006, their single “Kibun Jojo” became a hit, winning a gold award at the Japan Record Awards. mihimaru GT then performed in NHK’s year-end Kohaku Uta Gassen TV special. 
 In 2007, they performed in Kohaku Uta Gassen again, following up with performances at the Nippon Budokan and Yokohama Arena. 
 Leading up to the duo’s hiatus in 2013, they went on to win numerous music awards, including a Gold Artist Award and an award from the Japan Cable Awards. 
 Having had roughly eight years to recharge, hiroko announced she’s resuming her solo career in April of 2021.