Tsutsuizutsu (also read as tsutsuitsutsu in some cases. It is written as 'tsutsuizutsu'(つつゐづつ) in the old kana notation) is a story in "Ise Monogatari" (The Tales of Ise) and "Yamato Monogatari" (The Tales of Yamato).
筒井筒（つついづつ、つついつつと読む場合も。旧かなでは「つつゐづつ」）は、『伊勢物語』、『大和物語』中の物語の一つ。