| Karl Ljungberg | |
| Birth Name: | Karl Johan Ljungberg |
| Nationality: | Swedish |
| Birth Date: | 22 November 1868 |
| Birth Place: | Stockholm, Sweden |
| Death Place: | Stockholm, Sweden |
| Occupation: | Engineer |
Karl Johan Ljungberg (22 November 1868 – 11 July 1943) was a Swedish civil engineer who was a professor at KTH Royal Institute of Technology. He also represented his native country at the 1908 Summer Olympics in Ryde, Isle of Wight, Great Britain in the 8 Metre keelboat, placing fifth.[1]