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- Region:Japan
- Type:OVA
- English name:Natsume Yuujinchou: Itsuka Yuki no Hi ni / Natsume’s Book of Friends: On a Certain Snowy Day
- Official name:夏目友人帳 いつかゆきのひに
- Chinese name:夏目友人帐 曾几何时下雪之日
- Other names:夏目友人帐 OVA / 夏目友人帐 下雪的日子
- Premiered:February 5, 2014
- Status:Finished Airing
- Tags:Fantasy / Healing / Daily / Source manga
- Original author:緑川ゆき
- Director:出合小都美 / 大森貴弘
- Scenario:吉永亜矢
- Studios:Brain's Base
- Producers:「夏目友人帳」製作委員会
- Family:Natsume's Book of Friends
- Rating:12+
Natsume Yuujinchou: Itsuka Yuki no Hi ni
During a winter walk, Natsume Takashi meets a snowman yokai who is searching for something she is lost and cannot seem to recall and decides to help her despite not knowing what exactly she is looking for.