Does OSHA 10 count as credit towards OSHA 30?

No. While the OSHA 30 course also covers the material in OSHA 10, they are considered separate courses and must each be taken in their entirety. It is also noted that the OSHA 10 hour training course is not a prerequisite for the OSHA 30. You may enroll in the OSHA 30 any time regardless if you have taken the OSHA 10 hour course.