Alliance Club Horsens (), commonly referred to as AC Horsens () or simply Horsens, is a Danish professional football club based in Horsens, Central Denmark Region. Founded in 1994, as a superstructure on Horsens fS (founded 1915), Stensballe IK and FC Horsens, the club competes in the Danish 1st Division, the second tier of the Danish football league system. Both Stensballe IK and FC Horsens has later left the cooperation, and only Horsens fS remains.
In the first half of the 1994–95 1st Division season, AC Horsens finished at the bottom of the table after winning only a single game, and did not proceed to the Qualification League. In the second half of the season, AC Horsens managed three victories, but finished last and were relegated to the 2nd Division. Danmarksturneringen 1994–95 , Peders Fodboldstatistik AC Horsens spent two seasons in the 2nd Division before winning promotion back to the 1st Division. Danmarksturneringen 1995–96 , Peders Fodboldstatistik Danmarksturneringen 1996–97 , Peders Fodboldstatistik From the 1997–98 1st Division season forward, AC Horsens established itself as a consistent part of the 1st Division, Danmarksturneringen 1997–98 , Peders Fodboldstatistik as they finished just below the promotion candidates for five consecutive seasons.
In July 2001, Horsens hired former Danish international Kent Nielsen as their new manager. The 2002–03 1st Division season did not go well for Den Gule Fare (The Yellow Danger). After the winterbreak halfway through the season, the club was close to relegation to the 2nd Division, but a good ending of the season secured an 11th place, seven points from the relegation zone. Danmarksturneringen 2002–03 , Peders Fodboldstatistik In the next season, ACH started out on amazing form. After 15 matches, AC Horsens were leading the 1st Division with 40 points, but a weak finish to the season saw the club surpassed by Silkeborg IF and Randers FC, who won promotion to the Superliga four points ahead of Horsens. Danmarksturneringen 2003–04 , Peders Fodboldstatistik In the 2004–05 1st Division season, Horsens finally succeeded in winning promotion. Though amassing only one point more than in the 2003–04 season, AC Horsens finished in the runner-up spot, trailing winners SønderjyskE by a single point. Danmarksturneringen 2004–05 , Peders Fodboldstatistik
In their first year in the Superliga, AC Horsens became famous for their strong defence, as they finished in 10th place and avoided relegation. They drew 13 of 33 matches; 8 of them ending 0–0. They conceded just 41 goals in 33 matches, a statistic only bettered by the defences of the top-three finishing teams that season. SAS Ligaen 2005–06 , Haslund.info
The Superliga season of 2006–07 saw AC Horsens take an early lead over relegation rivals Vejle Boldklub and Silkeborg IF. In the spring of 2007, a slew of strong performances were followed by a series of disappointing defeats and draws, which again brought AC Horsens dangerously close to relegation. New offensive midfielder Henrik Hansen joined the squad midway through the season and became a key player, whereas striker and Canadian national Ali Gerba finished a half-year loan period in the summer of 2007 without being offered a contract. Instead, Brazilian Gilberto Macena from the Danish 2nd Division East team Holbæk B&I became the top scorer for AC Horsens, netting twelve times during the season. The team was relegated from Superliga to 1st Division following the 2020–21 season then promoted back to Superliga after winning the 1st Division in the 2021–22 season.
The 2022–23 season proved challenging for Horsens. The team struggled to maintain a clean sheet from October 2022 to June 2023, conceding a league-high 58 goals. Ultimately, their relegation occurred due to goal difference, narrowly missing out to Lyngby Boldklub, who had not won in the first 16 fixtures of the season.
| 2012–13 | UEFA Europa League | Third qualifying round | IF Elfsborg | 1–1 | 3–2 | 4–3 |
| Play-off round | Sporting CP | 1–1 | 0–5 | 1–6 | ||
| ! Season ! ! Pos. ! Pl. ! W ! D ! L ! GS ! GA ! P !Danish Cup !Notes | ||||||
| 1994 spring | QL | 8 | 8 | 11 | Did not competeRelegated | |
| 1994 autumn | 1D | 10 | 11 | 8 | Third round | |
| 1995 spring | 1D | 8 | 5 | 12 | Relegated | |
| 1995 autumn | 2D | 6 | 6 | 18 | Fourth round | |
| 1996 spring | 2D | 3 | 2 | 24 | ||
| 1996 autumn | 2D | 3 | 3 | 29 | Second round | |
| 1997 spring | 2D | 2 | 2 | 28 | Promoted | |
| 1997–98 | 1D | 5 | 10 | 44 | Fourth round | |
| 1998–99 Danmarksturneringen 1998–99 , Peders Fodboldstatistik | 1D | 6 | 12 | 44 | Fourth round | |
| 1999-00 Danmarksturneringen 1999-00 , Peders Fodboldstatistik | 1D | 5 | 8 | 50 | Fourth round | |
| 2000–01 Danmarksturneringen 2000–01 , Peders Fodboldstatistik | 1D | 7 | 9 | 43 | Fifth round | |
| 2001–02 Danmarksturneringen 2001–02 , Peders Fodboldstatistik | 1D | 7 | 10 | 44 | Third round | |
| 2002–03 | 1D | 11 | 12 | 36 | Third round | |
| 2003–04 | 1D | 3 | 6 | 62 | Quarter-final | |
| 2004–05 | 1D | 2 | 5 | 63 | Semi-final | Promoted |
| 2005–06 | SL | 10 | 12 | 37 | Fifth round | |
| 2006–07 SAS Ligaen 2006–07 , Haslund.info | SL | 10 | 17 | 28 | Quarter-final | |
| 2007–08 SAS Ligaen 2007–08 , Haslund.info | SL | 5 | 9 | 52 | Third round | |
| 2008–09 SAS Ligaen 2008–09 , Haslund.info | SL | 12 | 19 | 24 | Quarter-finalRelegated | |
| 2009–10 | 1D | 1 | 6 | 66 | Third roundPromoted | |
| 2010–11 | SL | 9 | 14 | 37 | Quarter-final | |
| 2011–12 | SL | 4 | 10 | 57 | Final | Qualified for 2012–13 UEFA Europa League |
| 2012–13 | SL | 11 | 15 | 34 | Semi-final | Relegated |
| 2013–14 | 1D | 5 | 11 | 52 | Semi-final | |
| 2014–15 | 1D | 6 | 11 | 42 | Third round | |
| 2015–16 | 1D | 3 | 9 | 60 | Third round | Promoted |
| 2016–17 | SL | 10 | 12 | 40 | Fourth round | |
| 2017–18 | SL | 6 | 12 | 40 | Third round | |
| 2018–19 | SL | 10 | 15 | 33 | Fourth round | |
| 2019–20 | SL | 8 | 13 | 47 | Semi-finals | |
| 2020–21 | SL | 12 | 18 | 24 | Fourth round | Relegated |
| 2021–22 | 1D | 1 | 6 | 64 | Fourth roundPromoted | |
| 2022–23 | SL | 11 | 18 | 28 | round of 16 | Relegated |
| 2023–24 | 1D | TBD | 0 | 0 | TBD |
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