Hairul Syirhan (born 21 August 1995), better known as Hairul, is a Singaporean professional footballer who plays as a goalkeeper for Singapore Premier League club Geylang International and the Singapore national team.

Hairul started his career with the Geylang International Prime League squad and was promoted to the 2015 S.League squad after impressing in the Prime League in the 2014 season.

In 2017, he was drafted to the Garena Young Lions squad while serving his National Service.

Hairul returned to Geylang International ahead of the 2019 Singapore Premier League season.

After a decade of being at Geylang, he left the club to ventures for new journey and signed for Balestier Khalsa.

After a year at Balestier, Hairul returned to Geylang International ahead of the 2024–25 Singapore Premier League season.

Hairul was part of the initial Singapore U21 team called up for the 2017 Southeast Asian Games.

In June 2023, Hairul was called up to the senior squad for the first time to face Papua New Guinea and Solomon Island but yet failed to make a single appearances. Hairul was called up again in September 2023 against Tajikistan and Chinese Taipei which he also missed out on on his international debut.