Miraz was born in Barisal and moved to Khulna at an early age with his parents. He grew up in Khalishpur of Khulna city and started playing cricket when he was 8. He went to Kashipur Cricket Academy from where he was first selected for the under 14 National Cricket Tournament.

In December 2015 he was named as the captain of Bangladesh's squad for the 2016 Under-19 Cricket World Cup. Miraz managed to take his team into semifinal but lost to West Indies. In 3rd place play-off, Bangladesh beat Sri Lanka by 3 wickets. Mehedi Hasan Miraz is named Player of the Tournament for his all round performance. He scored 242 runs and took 12 wickets in 6 matches.

Miraz made his first-class debut against Rajshahi Division cricket team on 16 February 2015. On his debutante matches he made 51 run (he batted only first innings) and took 4 wickets. He made his Twenty20 (T20) debut on 9 November 2016 playing for Rajshahi Kings in the 2016–17 Bangladesh Premier League.^[13]

Test cricket

Mehedi had a dream debut series as a Test player. After the remarkable 2016 Under-19 Cricket World Cup there was never any doubt in the team management's mind that they had found themselves an exceptional talent - in fact, in an echo of Australia's unveiling of Shane Warne on the 1993 Ashes tour. He was expected to debut a month ago for Afghanistan ODIs but was deliberately omitted to keep him as a secret from England.^[14]

On 20 October 2016, Mehedi made his Test debut against England. Even though he is an off break bowler, he opened the bowling in his maiden Test innings.