Christian Day (born 24 June 1983) is a retired rugby union player who last played for Northampton Saints in the Aviva Premiership.

In the 2005–2006 season, Day played as a replacement in the final as Sale Sharks won their first ever Premiership title.

[6] Day stepped down from his position as the Chairman of the Rugby Players' Association in November 2017, handing the role to Harlequins prop Mark Lambert.

[7] Day was amongst the squad that helped Saints' second team, the Northampton Wanderers, clinch the 2016/17 Aviva 'A' League trophy, though was not in the side for the final against Gloucester United.

In March 2020, Day appeared on the general public edition of BBC TV cookery competition MasterChef, progressing to the final 7 before being eliminated after making a vital error in the eyes of the judges twice.