| Karl Decker | |
| Birth Date: | 5 September 1921 |
| Birth Place: | Vienna, Austria |
| Position: | Attacking midfielder/Inside forward |
| Youthyears1: | 1934 |
| Youthclubs1: | Ottakringer SC |
| Youthyears2: | 1934–1937 |
| Youthclubs2: | Schwarz-Weiß Wien |
| Youthyears3: | 1937 |
| Youthclubs3: | Weiße Elf Penzing |
| Years1: | 1937–1952 |
| Caps1: | 226 |
| Goals1: | 244 |
| Years2: | 1952–1954 |
| Caps2: | 36 |
| Goals2: | 22 |
| Years3: | 1954–1956 |
| Caps3: | 37 |
| Goals3: | 15 |
| Years4: | 1956–1958 |
| Caps4: | 1 |
| Goals4: | 0 |
| Nationalyears1: | 1942 |
| Nationalteam1: | Germany |
| Nationalcaps1: | 8 |
| Nationalgoals1: | 8 |
| Nationalyears2: | 1945–1952 |
| Nationalteam2: | Austria |
| Nationalcaps2: | 25 |
| Nationalgoals2: | 19 |
| Manageryears1: | 1951–1952 |
| Managerclubs1: | First Vienna |
| Manageryears2: | 1952–1954 |
| Managerclubs2: | Sturm Graz |
| Manageryears3: | 1956–1958 |
| Managerclubs3: | FC Grenchen |
| Manageryears4: | 1958–1964 |
| Managerclubs4: | Austria |
| Manageryears5: | 1964–1965 |
| Managerclubs5: | Wiener Sport-Club |
| Manageryears6: | 1966–1968 |
| Managerclubs6: | Wiener Sport-Club |
| Manageryears7: | 1968–1970 |
| Managerclubs7: | SK Rapid Wien |
Karl Decker (5 September 1921 – 27 September 2005) was an Austrian footballer and manager. He is usually regarded as one of Austria's greatest players and one of the most prolific players of his generation.
As a player Decker played for both Germany and Austria national football team, scoring 27 goals in 33 matches.[1] He was also part of Austria's squad for the football tournament at the 1948 Summer Olympics, but he did not play in any matches.[2]