Carl Liam Piergianni (born 3 May 1992) is an English professional footballer who plays as a centre-back for EFL League One club Stevenage.

He debuted for Peterborough's first team in December 2010, making his only senior appearance for the club before his departure at the end of the 2010–11 season.

After a season at Stockport, Piergianni left the club in August 2012, after they were no longer in a position financially to extend his contract.

Following a brief spell in Australia, where he played for South Melbourne, Piergianni returned to England and signed for National League North club Salford City in May 2017.

[3] Whilst still playing for the club's under-18 team, Piergianni joined Spalding United on a work experience loan, where he made six first-team appearances in the Northern Premier League Division One South.

[14] He left Stockport at the end of August 2012, with Director of Football Jim Gannon stating the club were no longer in a position financially to offer the defender a new contract.

[15] After leaving Stockport, Piergianni joined Conference North club Corby Town on a non-contract basis on 10 October 2012.

[26] Piergianni returned to England and signed a two-year contract with National League North club Salford City on 19 May 2017.

[34] Wanting to play first-team football, Piergianni joined fellow League Two club Oldham Athletic on 6 January 2020, on a loan agreement until the end of the 2019–20 season.

[35] Oldham manager Dino Maamria highlighted the centre-back's leadership skills and character when the signing was announced.

[36] He made 11 appearances during the loan spell before the League Two regular season was curtailed due to the COVID-19 pandemic in March 2020.

[41] He won the PFA Community Champion award for the second consecutive season in recognition of his continued work with the OACT.

[44] He made his Stevenage debut in a 2–1 away victory against Tranmere Rovers on 30 July 2022 and scored his first goal in a 1–0 win against Rochdale on 16 August 2022.

[37][53] His ability to win aerial duels has been described as one his main strengths, as well as blocking attacking shots and clearing the ball out of defence.

[54] Having been appointed as club captain at Corby Town, Oldham and Stevenage, his leadership skills have also been highlighted as a strength.