How old do you have to be to scuba dive in the US?

each recognized diving training institute has it's own age requirements w/specific limitations - PADI has the most leinient standards

PADI
* 10 years old (less than 40' deep)
* Students younger than 15 years, who successfully complete the course qualify for the PADI Junior Open Water Diver certification, which they may upgrade to PADI Open Water Diver certification upon reaching 15.(less than 70' deep)
You must be at least 13 years old to take Scuba lessons online with PADI eLearning, due to international internet laws. If you're younger, you can still learn to dive - just have your parent or legal guardian contact your local PADI Dive Shop or Resort.