Miss August-Hanson MLC, who was successfully elected into the Legislative Council in March, will take over from Clare Bettison MHK who has been the Post Office's Vice Chairman since April last year.
On the appointment approved by Tynwald this week, Julie Edge MHK, Chairman of Isle of Man Post Office, said: "The Board of IOMPO are looking forward to working with Miss August-Hanson MLC and we wish to extend our appreciation to our outgoing Vice Chairman Clare Bettison MHK for her hard work and contribution she has given to Isle of Man Post Office."