| John Danielsen | |
| Birth Date: | 13 July 1939 |
| Birth Place: | Odense, Denmark[1] |
| Height: | 1.80 m |
| Position: | Midfielder |
| Years1: | 1957–1965 |
| Clubs1: | B 1909 |
| Caps1: | 157 |
| Goals1: | 55 |
| Years2: | 1965–1970 |
| Clubs2: | Werder Bremen |
| Caps2: | 131 |
| Goals2: | 17 |
| Years3: | 1970–1973 |
| Clubs3: | Chiasso |
| Caps3: | 69 |
| Goals3: | 8 |
| Years4: | 1973 |
| Clubs4: | B 1909 |
| Caps4: | 5 |
| Goals4: | 0 |
| Totalcaps: | 362 |
| Totalgoals: | 80 |
| Nationalyears1: | 1956 |
| Nationalteam1: | Denmark U19 |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 1 |
| Nationalyears2: | 1958–1960 |
| Nationalteam2: | Denmark U21 |
| Nationalcaps2: | 4 |
| Nationalgoals2: | 1 |
| Nationalyears3: | 1958–1964 |
| Nationalteam3: | Denmark |
| Nationalcaps3: | 27 |
| Nationalgoals3: | 7 |
John Danielsen (born 13 July 1939) is a Danish former footballer who played as a midfielder. During his club career he played for Boldklubben 1909. He earned 27 caps for the Denmark national team,[2] won a silver medal in football at the 1960 Summer Olympics,[3] and was in the finals squad for the 1964 European Nations' Cup.[4] He played for 1909 from Odense in Denmark. He was transferred to the German club Werder Bremen, later returning to play for B 1909 again at the end of his career in the early 1970s.[5]