Do you mean Melbourne, Australia or Melbourne, Florida (USA)? I’ll include short lists for both. I also note important safety points about supervising children around hotel pools — see the safety section at the end.

Melbourne, Australia — hotels with on‑site pools commonly used by families

• Quay West Suites (Southbank) — indoor 15 m magnesium (MagnaPool®) lap pool and spa; frequently cited as family friendly. (quaywestsuitesmelbourne.com.au)
• The Langham (Southbank) — heated indoor 15 m pool (Chuan Spa); hotel lists family/kids facilities. (langhamhotels.com)
• Crown Metropol / Crown Promenade / Crown Towers (Southbank) — each has heated indoor 25 m pools (level information and family access notes on Crown sites); hotels require adult supervision for children. (crownmelbourne.com.au)
• Novotel Melbourne on Collins — heated indoor pool at the fitness centre; Novotel markets family benefits (note: check current availability — Novotel has previously scheduled pool refurbishments). (novotelmelbourne.com.au)
• Adelphi Hotel (Flinders Lane) — rooftop glass‑bottom pool (small, unpatrolled rooftop pool; hotel guests only). (adelphi.com.au)
• Park Hyatt Melbourne — heated indoor pool (hotel lists indoor pool among leisure facilities). (parkhyattmelbourne.au-hotels.net)

Notes about these listings

• Pool features vary (lap vs resort style, shallow toddler area vs deeper lap pool, indoor vs rooftop). I linked each hotel’s facilities page above — check the hotel page or call ahead to confirm pool depth, children’s/toddler areas, opening hours and any age rules or guest‑only policies. (quaywestsuitesmelbourne.com.au)

Melbourne, Florida (USA) — hotels with family/outdoor pools

• Residence Inn by Marriott Melbourne — outdoor pool (family‑friendly extended‑stay property). (marriott.com)
• Holiday Inn Melbourne‑Viera — outdoor pool; family amenities and conference centre. (ihg.com)
• Hilton Melbourne Beach Oceanfront — outdoor pool and beach access (oceanfront property). (hilton.com)
• Crowne Plaza Melbourne‑Oceanfront and several Holiday Inn Express / Best Western / other local hotels also list pools — check the specific property pages for pool type and rules. (ihg.com)

Essential safety and booking tips (important)

• Most hotel pools are not lifeguarded. Hotels commonly require that children be supervised by an adult; some specify age limits for unsupervised use (see Crown hotels’ pool pages). Always confirm whether lifeguards are present and the hotel’s supervision rules before you book or use the pool. (crownmelbourne.com.au)
• Victorian / Australian guidance: children under 5 should be within arm’s reach; under‑10s must be in sight at all times. Coroners and health authorities emphasise active, undistracted supervision around hotel pools. Learn CPR and check pool fences/gates where applicable. (Relevant guidance: Better Health Victoria, Coroners Court of Victoria, Victorian government advice). (betterhealth.vic.gov.au)
• Pool availability can change (maintenance or refurbishment). Example: Novotel Melbourne on Collins has previously published temporary pool closure dates — confirm the pool is open for your travel dates. (novotelmelbourne.com.au)

If you want, I can:

• Build a short list filtered to your needs (CBD vs Southbank vs near the beach), ages of your children, or your travel dates and budget, and check current pool status/hours for specific hotels.