| Ludwig Ernstsson | |
| Birth Date: | 29 April 1972 |
| Birth Place: | Växjö, Sweden |
| Position: | Striker |
| Youthyears1: | 1987–1992 |
| Youthclubs1: | Öster |
| Years1: | 1992–1996 |
| Years2: | 1997–1998 |
| Years3: | 1998–2000 |
| Years4: | 2000–2003 |
| Clubs2: | Kongsvinger[1] |
| Clubs3: | Austria Wien[2] |
| Clubs4: | Öster |
| Caps2: | 38 |
| Goals2: | 10 |
| Caps3: | 28 |
| Goals3: | 4 |
| Manageryears1: | 2009–2010 |
| Manageryears2: | 2010 |
| Managerclubs1: | Öster (assistant) |
| Managerclubs2: | Öster (head coach July–September) |
Ludwig Ernstsson (born 29 April 1972) is a retired Swedish football striker.
He grew up in both Räppe and Ör, since his parents were separated.[3] He joined Östers IF, made his senior debut in 1992 and joined Kongsvinger IL in 1997.[2] Here he scored ten Norwegian Premier League goals in 1997 and 1998.[1] In the middle of the season he left Kongsvinger for Austria Wien. He stayed here until 2000, when he returned to Öster.[2]
After retiring he became a youth coach. In 2009, he was promoted to assistant coach for the senior team.[4] In July 2010 he was promoted to head coach,[5] only to be replaced two months later - following a six-game losing streak - by Hans Gren.[6] Another two months later, on November 10, it was announced that Ernstsson and Öster parted ways for the time being.[7]