No, the Southern Colonies were not Spanish colonies. They were British colonies established by settlers from England in the 17th and early 18th centuries. The Southern Colonies typically included Maryland, Virginia, North Carolina, South Carolina, and Georgia.
Spain did have colonies in parts of North America, particularly in areas like Florida and the southwestern United States, but the Southern Colonies were primarily under British control. The Spanish influence in North America was significant, especially in regions that are now part of the southern United States and in the Caribbean, but it was separate from the English colonies.