Hans-Joachim Hartnick (born 12 January 1955) is a retired East German cyclist. He had his best achievements in the 100 km team time trial. In this discipline he won a silver medal at the 1980 Summer Olympics, a bronze medal at the world championships in 1974 and a gold medal at the world championships in 1979; his team finished in 10th place at the 1976 Summer Olympics.
Individually, he won the following races:
He finished in second place in the Peace Race in 1975.