Kyunki Saas Bhi Kabhi Bahu Thi (transl. Because Even a Mother-in-Law Was a Daughter-in-Law Once) is an Indian Hindi-language soap opera that aired from 3 July 2000 to 6 November 2008 on Star Plus. The show was co-produced by Shobha Kapoor and Ekta Kapoor under their banner Balaji Telefilms.

The show revolves around an ideal daughter-in-law, the daughter of a pandit married to the grandson of business tycoon Govardhan Virani. The role of Tulsi Virani was played by Smriti Irani, who holds the record for winning 5 consecutive Best Actress-Popular awards from Indian Television Academy Awards and 2 Indian Telly Awards. Debuting alongside Kaun Banega Crorepati on July 3, 2000, on StarPlus, Kyunki... was the most successful serial at its time, garnering double digit TRPs for six continuous years, peaking at 22.4 in May 2001. Kyunki... marked a turning point for producer Ekta Kapoor and StarPlus, and resulted in iconic serials Kahaani Ghar Ghar Kii and Kasautii Zindagii Kay (2001 TV series), forming the big 3 for the channel through the 2000s. The show won 5 consecutive Best Serial-Popular awards from ITA and 6 consecutive Best Continuing Serials from Indian Telly Awards.