Yes, Oceanogràfic Valencia has an on-site parking facility with 800 spaces available for visitors. The parking lot is accessible for vehicle entry up to one hour before the aquarium closes, and you can exit up to half an hour after closing time.
Note: If you present your Oceanogràfic ticket at the parking control center or shops, you can benefit from a flat rate of €7 per day (or €8 during high season and special holidays)