| Bertus de Harder | |
| Fullname: | Johannes Lambertus de Harder |
| Birth Date: | 14 January 1920 |
| Birth Place: | The Hague, Netherlands |
| Death Place: | Jeumont, France |
| Height: | 1.73 m |
| Position: | Striker |
| Years1: | 1937–1949 |
| Clubs1: | VUC Den Haag |
| Years2: | 1949–1954 |
| Clubs2: | Bordeaux |
| Years3: | 1954–1956 |
| Clubs3: | Holland Sport |
| Years4: | 1956–1957 |
| Clubs4: | AS Angoulême |
| Nationalyears1: | 1938–1955 |
| Nationalteam1: | Netherlands |
| Nationalcaps1: | 11 |
| Nationalgoals1: | 3 |
| Manageryears1: | 1957–1960 |
| Managerclubs1: | AS Angoulême |
| Manageryears2: | 1962–1964 |
| Managerclubs2: | Mulhouse |
Johannes Lambertus (Bertus) de Harder (14 January 1920 – 7 December 1982) was a Dutch footballer who played as a striker. He scored 3 goals in 11 games for the Netherlands national team.[1] He represented the Netherlands at the 1938 FIFA World Cup.
He played for FC Girondins de Bordeaux in France where he later became a manager with AS Angoulême and FC Mulhouse.[2]