Blair Simon Kinghorn (born 18 January 1997) is a Scottish professional rugby union player who plays as a fullback for Top 14 club Toulouse and the Scotland national team.

Kinghorn was born and raised in Edinburgh. Having earlier played football, he focused on rugby from age 15.

Edinburgh signed Kinghorn on a two-year professional contract straight from Edinburgh Academy.

He made his professional debut as a 70th-minute substitute in Edinburgh's match against Zebre in the 2015–16 Pro12. He scored his first try for the club the following season against Benetton, going on to score a total of 36 tries for Edinburgh, leaving him currently fourth in the list of most tries scored for the club. In total, Kinghorn scored 327 points for Edinburgh with 19 penalties and 45 conversions to go with his impressive try haul.

He had 139 Caps for Edinburgh with a very impressive 86% start rate (122 starts, 17 appearances as a replacement and only 3 not used when selected in the match day 23). He is currently the youngest player to have reached 100 caps for Edinburgh, having achieved this at aged 24 years and 117 days.

Kinghorn left Edinburgh to join Toulouse in December 2023, with his new club paying a six-figure fee to buy out the 26-year-old’s contract which was due to expire in June 2024. Kinghorn scored two tries on his Toulouse debut on 9 December 2023 against Cardiff in the Champions Cup.

Kinghorn performed well for Stade Toulousain, by the 2023/24 Champions Cup Final Kinghorn earned the starting position over teammate and French international Thomas Ramos, as he scored 12 points from the tee and made a crucial tackle to stop a breakaway try, helping Toulouse to their 6th European Title which they won in extra time.

During Kinghorn's time at Toulouse to date, the team have won both the 2023-24 and 2024-25 Top 14 championships.