How do you address a cultural attache of an embassy?

When addressing a cultural attaché of an embassy, it's appropriate to use their formal title, followed by their last name. For example, you would say "Dear Cultural Attaché [Last Name]" in written correspondence. In conversation, you can simply refer to them as "Cultural Attaché [Last Name]" or "Mr./Ms. [Last Name]" if you know their gender. Always maintain a respectful and professional tone.