The Maryland Ornithological Society (MOS) is a statewide organization of local chapters. Each chapter sets its own dues, a portion of which goes to the state Society. At-large membership (no local chapter association) is also available. The MOS and chapter membership year begins September 1.

Choose a chapter close to your residence or workplace, or select Membership-At-Large to join MOS without belonging to an individual chapter. After you join an MOS chapter or Member-At-Large, you also may join another chapter with Associate status, paying just that chapter’s portion of dues.

MOS publishes our bi-monthly newsletter, The Yellowthroat, and our periodical journal Maryland Birdlife. Individual chapters may also publish a newsletter. All of these are benefits of membership. You will also receive notice of our annual conference held in a location in Maryland near good birding sites. Members-At-Large receive MOS publications but obviously no chapter newsletters unless they choose to join a chapter as an Associate.

The benefits received from Maryland Ornithological Society membership dues are not considered to be substantial as determined by criteria in IRS Publication 526. Therefore, members may claim a tax deductible charitable contribution for the full amount of their membership dues.

MOS doesn’t release its membership list to any other organization and uses it only for official communication with members. Members may select several preferences for correspondence and notifications via our membership portal. MOS adopted and follows its official Privacy Policy.