Lynn was appointed Ioan Cunningham’s successor in January.
He will link up with the Wales squad full time after completing the Premiership Women’s Rugby (PWR) season with Gloucester-Hartpury, who are chasing a third successive title.
“I know how much being Wales captain means to Hannah,” said Lynn
“She is somebody who wants to win and has been a mainstay at centre for club and country.
“I know how important leadership is to every side and have worked with three national captains and they all set the standards and drive the team culture.
“The Wales team culture will be a family one where we all care for each other, but we will challenge each other.”
Wales kick off their Six Nations campaign away to Scotland on Saturday, 22 March.
