Do I need to send invites to my vendors?

No, you don't need to. However, I LOVE getting them from my couples as a memento from the wedding. I also think the photographer should get one, too - and then bring it to the wedding for photos. I love to see the invite photos!

You don't need to send them, but your photographer will want one for some detail shots.

Dana is right- if you have extras pass one along to your photographer and he/she should include it in some nice detail shots- might even end up being the cover of your coffee table book.

You don't need to send invites to vendors since they are being paid for their services. Unless they're a friend that you would have invited to your wedding regardless.

No, but because it is customary to provide the vendors (DJ, photographer, etc) with meals. Therefore, if you choose to provide them a dinner alongside your regular guests, you will want to make sure to contact the vendors to ensure you have their preferred entree choice.

And although you do not need to send the vendors a formal invitation, I would recommend sending them somewhat of an invitation (in the form of the day's scheduled events). Doesn't have to be anything fancy, but just to make sure they know when to be and where!

It's considered a nice gesture and good etiquette to invite your officiant to both your rehearsal dinner and your wedding reception, so they would receive both invitations.

For other vendors (i.e. Photographer, DJ, Musician) it is not required. However, they may have something in their contract that says they need to be provided a meal at the reception, so review and plan accordingly.

Reference: Emily Post Wedding Etiquette