Can I give my Fiance a Green Card if I'm 17 years old?

If it is legal for you to marry at the age of 17 in the state where you reside and plan to marry, then you can apply for a fiance visa for your fiance.

You can petition for your fiance even if you are only 17 years old as long as your marriage is legally recognized in your state.

If you are a US citizen, you may file an immigration petition for your husband after you are legally married. However before your husband can get a green card you must qualify as a sponsor who can sign an affidavit of support for him. The law says you must be at least 18 years old to qualify to be a sponsor on an affidavit of support. Therefore your husband cannot get a green card until you are 18 years old. You may also need a co-sponsor. For this reason, it may be best to wait until you are 18 years old to start an adjustment of status for your husband. You and your fiance should consult an immigration attorney as soon as possible. Please do so before the wedding.

You cannot GIVE anyone a green card. When you are married, you can file a visa petition for your spouse if you are a US citizen. You may need your parent's permission to marry depending on where you live. If your boyfriend entered the US with a visa, he can apply for adjustment of status at the same time you file the I-130 visa petition.