藤原良房(ふじわら の よしふさ，804年－872年10月7日)，日本平安时代公卿，藤原氏北家藤原冬嗣次男，母藤原美都子，妻嵯峨天皇皇女源洁姬。官至从一位摄政太政大臣，准三宫。去世后赠正一位，封美浓公，谥忠仁。世称染殿大臣，或称白河殿 。

女明子，洁姬所生，入宫为文德天皇女御，生惟仁亲王(清和天皇)。文德天皇去世后，良房摄政辅佐年幼的外孙清和天皇。清和天皇自幼长于良房宅邸，对良房之信赖终其身不变，时常寻幸染殿花亭 。

良房任摄政是日本史上，初次由非皇族的臣子担任摄政；其后藤原北家子孙相继担任摄政、关白，可说是良房奠定的基础 。无子，以兄长良子基经为后。

Fujiwara no Yoshifusa(藤原 良房, 804 – October 7, 872), also known as Somedono no Daijin or Shirakawa-dono, was a Japanese statesman, courtier and politician during the Heian period.

When Yoshifusa's grandson was enthroned as Emperor Seiwa, Yoshifusa assumed the role of regent (sesshō) for the young monarch. He was the first sesshō in Japanese history who was not himself of imperial rank; and he was the first of a series of regents from the Fujiwara clan.