单侧花（学名：Orthilia secunda）为鹿蹄草科单侧花属下的一个种。

Orthilia secunda is a flowering plant of the genus Orthilia in the family Ericaceae. It is the only member of the genus. Its common names are sidebells wintergreen, one-sided-wintergreen and serrated-wintergreen, and it was previously part of genus Pyrola, the wintergreens.