Saim Ayub is a Pakistani cricketer who plays for the Pakistan national cricket team and for Karachi Whites in domestic cricket. He made his international debut in T20 against Afghanistan in March 2023 and made his test debut against Australia in the third test in January 2024. Later, he made his ODI debut against Australia in November 2024.

His father Ayub Ahmed and his uncle Mohammad Javed both played cricket at the club level, Saim was initiated into the game at a young age with tape ball cricket from Gulistan-e-Johar, helped by his father as well by two elder brothers.

In December 2022, alongside fast bowler Ihsanullah and batsman Haseebullah Khan, Saim Ayub was one of the three youngsters selected to be included in the national squad for the second Test match of the New Zealand series in Karachi, so they could get some international exposure and see the dynamics of the dressing room.

In March 2023, he was named in Pakistan's Twenty20 International (T20I) squad for the series against Afghanistan. He made his T20I debut in the first T20I of the series, on 24 March 2023. On 20th November 2023, he was selected in Pakistan's Test squad for the series in Australia. He made his debut on 3 January 2024 in the third test match of the series. He got out for a duck in his first innings.