Is Swimming in Mixed-Gender Pools Haram?
Swimming in mixed-gender pools is not permissible in Islam.
These environments almost always involve exposure of ‘awrah and make it difficult to lower the gaze—both of which are strictly commanded in Islam. What may seem normal socially can still be spiritually harmful.
Allah تعالى says:
“Tell the believing men to lower their gaze and guard their chastity…”
(Surah An-Nur 24:30)
In such settings, maintaining modesty becomes nearly impossible, which leads to fitnah (temptation) and opens the door to sin. Islam blocks not only sin itself, but also the paths that lead to it.
References:
Fatawa Hindiyyah (Vol. 5, p. 328):
“Gathering together is impermissible due to exposure of ‘awrah and looking at it.”
Radd al-Muhtar (Ibn ‘Abidin) (Vol. 6, p. 371):
“Whatever leads to the unlawful is itself unlawful.”
A believer should choose environments that protect their haya (modesty) and keep them بعيد from doubtful matters.
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And Allah knows best.