announcer

someone who proclaims a message publicly

• caller — someone who proclaims or summons in a loud voice
• caller, caller-out — a person who announces the changes of steps during a dance
• muezzin, muazzin, mu'adhdhin — the Moslem official of a mosque who summons the faithful to prayer from a minaret five times a day
• town crier, crier — (formerly) an official who made public announcements

• communicator — a person who communicates with others