Is it a third person pronoun?

Yes, the pronoun 'it' is a third person pronoun; a Word that takes the place of a noun for a thing spoken about.

The first person is the person speaking.

• the first person pronouns are: I, we, me, us

The second person is the person spoken to.

• the second person pronoun is: you

The third person is the person or thing spoken about.

• the third person pronouns are: he, she, it, they, them