Gmail Overview‎ > ‎Groups‎ > ‎

Creating a Group

Sign into your email account, then click More - and select Contacts
More - Contacts

From the list on the left select New Group

Name your new group in the pop-up window:

Now, click on the name of your group on the left, then click the person with the plus sign to add users:
Start typing in names/email addresses.  If you have emailed them before, it should auto-complete for you.  Just hit enter after each one and it will insert the address and a comma and you can begin the next name.  When you are finished, click Add.

Now, when you compose an email, you will just need to type the name of your group and it will go to everyone in it: