Weather can make or break a family vacation, especially with young children whose moods turn on whether they got their swim in. An indoor pool quietly solves that problem. Rainy mountain afternoon? Pool day. Too-hot midday sun in the Mediterranean? Pool day. Off-season ski trip with grey skies and tired legs? Definitely pool day. The hotels in this collection have built indoor pools designed for genuine family use. That means water heated to a temperature that actually works for toddlers (around 29 to 32 degrees), a separate shallow section so the youngest swimmers have their own space, and proper ventilation so the air feels fresh rather than overwhelming. The best of them also include water features, lazy rivers, or kid-friendly slides that turn the indoor pool into a destination rather than a rainy-day backup plan. Alpine properties in Austria and Switzerland are particularly good at this. Many feature aquatic centers that connect indoor and outdoor sections through a heated channel, so you can swim outside on a sunny winter day with steam rising off the water and snowy peaks all around. That's the kind of memory kids carry with them for years. Below are the top family hotels with an indoor pool, sorted by overall score.