Shreyas Santosh Iyer (born 6 December 1994) is an Indian international cricketer who plays for the Indian cricket team as a Right-handed batter. He has played in all formats for the Indian team. Iyer has scored a century in his debut test match and a half century in second innings against New Zealand in November 2021 and became the first Indian player to do so. Iyer plays for Mumbai in domestic cricket and captains Kolkata Knight Riders in the Indian Premier League. He played for the India Under-19 cricket team at the 2014 ICC Under-19 Cricket World Cup.

In 2014, Iyer represented Trent Bridge Cricket Team. During a trip of the UK, he played three matches scoring 297 runs at an average of 99 with a highest score of 171, a new team record.Iyer made his List A debut for Mumbai in November 2014, playing in the 2014-15 Vijay Hazare Trophy. He scored 273 runs in that tournament at an average of 54.60. Iyer made his first-class cricket debut in December 2014 during the 2014-15 Ranji Trophy. He scored a total of 809 runs in his debut Ranji season at an average of 50.56 including two centuries and six fifties. He was 7th highest scorer of 2014-15 Ranji Trophy.

In the 2015-16 Ranji Trophy, Iyer scored 1,321 runs during the tournament including four centuries and seven fifties at an average of 73.39, becoming the top scorer of the Ranji season and second player to score 1,300 runs in a single Ranji Trophy competition. In the 2016-17 Ranji Trophy, Iyer scored 725 runs including two centuries and two fifties at an average of 42.64. He scored 202 not out off 210 balls, against the visiting Australia team in a 3-Day Practice match in Mumbai, his highest first-class score.