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 Mihir, 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 Star Plus, Kyunki... was the most successful serial at its time, ranked number 1 with double digit TRPs for seven continuous years, peaking at 22.4 in May 2001. Kyunki... marked a turning point for producer Ekta Kapoor and Star Plus 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.