Can I use professional sport teams in a fictional book I am writing

Yes, you can use professional sport teams in a fictional book you are writing. However, there are some important things to keep in mind:

You can use the team's name, logo, and other identifying marks. However, you cannot use the names or likenesses of any real players without their permission.
You cannot use the team's name or logo in a way that suggests that the team is endorsing your book. For example, you cannot use the team's logo on your book cover without the team's permission.
You can use the team's name or logo in a way that is incidental to the story. For example, you can mention that the main character is a fan of the team, or you can use the team's name to create a setting for the story.
If you are using the team's name or logo in a way that is commercial, you will need to get the team's permission. For example, if you are selling merchandise that features the team's name or logo, you will need to get the team's permission.

Here are some related questions and answers:

Can I use the names of real players in my book? No, you cannot use the names or likenesses of any real players without their permission.
Can I use the team's name and logo in my book title? Yes, you can use the team's name and logo in your book title if the title is not commercial.
Can I use the team's name and logo on my book cover? Yes, you can use the team's name and logo on your book cover if you have the team's permission.
Can I use the team's name and logo in my book's description? Yes, you can use the team's name and logo in your book's description if the description is not commercial.
Can I sell merchandise that features the team's name and logo? Yes, you can sell merchandise that features the team's name and logo if you have the team's permission.

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Can I use professional sport teams in a fictional book I am writing?