A retirement letter is a formal document submitted by an employee to their employer to announce their decision to retire from their position. It serves as an official notification and typically includes the intended retirement date, gratitude for the opportunities provided, and, if applicable, an offer to assist in the transition process. A well-written retirement letter maintains professionalism while expressing appreciation for the experiences and relationships built over the years. It also helps ensure a smooth departure and leaves a positive impression. Whether retiring after decades of service or a shorter tenure, this letter marks an important career milestone.