How you address your boss depends on several factors, including the company's culture, the size of the organization, your boss's personal preference, and your level of familiarity with them. Here are a few common options:

Formal Titles:

- Mr./Ms./Mrs./Dr. [Last Name] : This is the most formal way to address your boss and is commonly used in traditional and hierarchical workplaces.

First Name:

- [First Name] : Using your boss's first name is more casual and friendly. However, it's essential to ensure it's appropriate in your company culture before using this form of address.

Titles without Surname:

- Mr./Ms./Mrs./Dr : For example, "Mr. Smith" is another polite option that omits the last name while still maintaining a level of formality.

Position:

- [Position]: Addressing your boss by their job title, such as "Director" or "Manager" can be appropriate, especially in larger organizations where it's common to use formal titles.

In a general sense, it's best to start with the most formal title and adapt as you become more comfortable in your workplace. If you're unsure what your boss prefers, you can ask them directly or observe how others in the company address them.