- HTH is an acronym, or abbreviation used in Internet slang, that means "Hope This Helps" or "Hope That Helps."
- HTH is also an abbreviation for High Tech High
- HTH is also an abbreviation for hand-to-hand, which means being at close quarters, in a close combat. The expression first appeared somewhere in the beginning of the 15th century. It is explained in the article melée.
- HTH® is also a brand name that sells pool maintenance chemicals such as granular Calcium Hypochlorite, used to chlorine shock a swimming pool
- HTHis also an acronym for High Tail Hall, a yiff site made with Macromedia Flash by Pendragon Entertainment
