Can you order contact lenses without a doctor's prescription?

Absolutely not if you want vision correcting contact lenses.  You can't guess at your vision and contact lenses have slightly different base curves and diameters based on your eye shape and size and only your eye doctor can prescribe the correct fitting and right and left eye powers for your needs.  You may be able to buy some cool cosmetic lenses without a doctor's prescription but our focus is not non prescription lenses.   So if you've never had an eye exam before and want to wear contacts then you should make an appointment to see your eye care provider.

IF you do have a doctor's prescription but it's just not current or valid that's a different question entirely.   See this FAQ for information pertaining to a 'current prescription for contact lenses'.