Billy Sean Burns (born 13 June 1994) is a professional rugby union player who plays for Munster.

[5] A product of Gloucester Rugby's academy, Burns made his first team debut as a seventeen-year-old substitute in a loss to London Irish in the LV Cup in February 2012.

In his first spell, in the 2012–13 season, he made 17 appearances in National League 2 South, scoring 71 points which included 6 tries, helping the club to 3rd place in the division.

[16] The following season Burns got more game time at Gloucester, accumulating 17 appearances across all competitions and making the bench for the side that won the 2014–15 European Rugby Challenge Cup.

[18] He was Gloucester's first choice fly-half for the 2016–17 and 2017–18 seasons, but after the club signed Danny Cipriani, Burns asked to be released from the last year of his contract.

[26] In November 2019, having established himself in the Ulster team and formed a strong half-back partnership with John Cooney, he agreed a renewed contract until June 2022.

[24] He received his first cap in a victory against Wales in the 2020 Autumn Nations Cup, coming off the bench to replace an injured Johnny Sexton in the first half, only to be taken off for a head injury assessment in the second.