Is Jo Dee Messina related to Jim Messina?

No, Jo Dee Messina and Jim Messina are not related. Jo Dee Messina is a Country Music artist known for her hits in the 1990s and early 2000s, while Jim Messina is a musician and producer associated with rock and Pop Music, particularly as a member of the bands Loggins and Messina and Buffalo Springfield. Their shared last name is coincidental, and there is no familial connection between them.