| Billy Hainey | |
| Fullname: | William Hainey |
| Birth Date: | 16 June 1939 |
| Birth Place: | Paisley, Scotland |
| Position: | Inside forward |
| Clubs1: | Johnstone Burgh |
| Years2: | 1961–1966 |
| Clubs2: | Partick Thistle |
| Caps2: | 111 |
| Goals2: | 28 |
| Years3: | 1966–1968 |
| Clubs3: | Dundee United |
| Caps3: | 46 |
| Goals3: | 8 |
| Clubs4: | St Mirren |
| Caps4: | 22 |
| Goals4: | 2 |
| Clubs5: | Portadown |
| Nationalyears1: | 1964[1] |
| Nationalteam1: | SFL trial v SFA |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 0 |
William Hainey (born 16 June 1939) is a Scottish former professional footballer who played as an inside forward. He played for Partick Thistle, Dundee United, St Mirren and Portadown.
Billy Hainey was born in Paisley, Renfrewshire, on 16 June 1939.[2]
Hainey played junior football for Johnstone Burgh before joining his first senior club, Partick Thistle, in 1961. He made 111 league appearances for Partick before he was sold to Dundee United for £8,000 in March 1966. At the beginning of the 1966–67 season, he became the first ever substitute used by Dundee United in a major competitive match, and also the first substitute to score for the club. In October 1966, Hainey scored Dundee United's first ever goal in European competition, in a 2–1 win over Barcelona in the Fairs Cup.[3] Hainey scored in both ties against Barcelona which is something very few players have ever done. He scored the second goal in the home tie in the 49th minute after Iain Mitchell had scored the opener on the 18th minute in United's 2-0 win at home on Nov 16th 1966 (4-1 on agg).
After losing his place in the Dundee United team, Hainey requested a transfer in October 1967. He was released on a free transfer in April 1968, later signing for St Mirren. He then joined Portadown in Northern Ireland.
Hainey was inducted into the Dundee United Hall of Fame in 2010.[4] He also played alongside Walter Smith at Dallas Tornado.