Sai Bhosale (née Nimbalkar) (1633 – 5 September 1659) was the first wife of Chhatrapati Shivaji Maharaj, the founder of the Maratha Empire. She was the mother of Shivaji's eldest son, Chhatrapati Sambhaji Maharaj, who succeeded Shivaji as king.

Saibai was a member of the prominent Nimbalkar dynasty. She was Mudhojirao Naik Nimbalkar's second daughter and sister of Bajaji Rao Naik Nimbalkar of Phaltan. Saibai's mother Reubai was from the Shirke dynasty. In the year 1630, Mudhojirao ruled over Phaltan. Before that he was a prisoner of Adilshah at Satara Fort. Shahaji (Shivaji's father) helped him escape prison. Out of appreciation, Mudhojirao gave his daughter Sai to Shivaji. The two of them got married in May of 1640.

The exact date of marriage is not known but Shivabharat mentions that it occurred after Shivaji was in his teens. The wedding likely took place when Shivaji was around 10–12 years old, and Sai Bai 7, around 1640-42 AD. The inscription at Thanjavur mentions Saibai's maiden surname as Pawar. But this is not in contradiction with other references as the original surname of Nimbalkar family was Pawar. A reference in Raja Shivachattrapati mentions the event to have taken place on 16 May 1640 AD, and that the marriage was conducted in Pune and Shahaji was unable to attend it as he was in Bangalore at that time.

They had three daughters namely Sakhubai, Ranubai and Ambikabai followed by their son Sambhaji. On 7 September 1661, a girl was born to Shivaji at Rajgad. She was named Sakvarbai. She was later said to be of "wheatish" complexion and was extremely beautiful. Ranubai was their seond daughter born in 1653. Ambikabai was their third daughter born in 1655. Chhatrapati Sambhaji Maharaj was their only son born on 14th may 1657 at Purandar fort. Saibai and Shivaji shared a close relationship; she was Shivaji's first and favourite wife. It is said that on his deathbed his last word was "Sai".

Read more about Sayeebai:  Issue, Death

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