"We are very excited that Katrina has accepted this role," he said. "Her impressive record as an international player combined with her coaching success made her the outstanding candidate to coach the White Ferns.
"She brings great qualities to the role, including a genuine passion for women's cricket developed over many years in the game as a player, mentor, and coach."
Keenan said it was a huge honour to be offered the White Ferns coaching role.
"I am incredibly motivated by working in women's cricket and excited by the opportunity to continue the good work of Gary Stead," she said. "The team has some big tours and tournaments ahead and I'm excited by the challenge and determined to work hard with the players to improve the performance of the White Ferns."
Keenan's first assignment will be to prepare the White Ferns for the upcoming Rose Bowl series in Australia before taking the team to next year's women's World Cup in India.