Hiroko Sadakane(貞包 紘子,Sadakane Hiroko?, born (1986-05-16)May 16, 1986 in Aichi) is a Japanese short-track speed-skater.
Sadakane competed at the 2010 Winter Olympics for Japan. She finished second in her opening round race of the 1500 metres, moving on to the semifinal. In the semifinal, she finished fourth, qualifying for the B Final, where she finished fourth again to end up twelfth overall. She was also a member of the 3000 metre relay team. She did not race in the semifinal, in which the team finished third, but did race in the B Final, with the team finishing fourth and ending up seventh overall.