克里昂米尼一世(？-约前489)，古希腊斯巴达城邦国王，在位时间为前520年 - 前490年或前488年。在他统治时间，斯巴达积极开拓疆土，影响力逐步扩大。在他统治时间，伯罗奔尼撒联盟正式成立。他曾经强烈干预雅典事务。

约前494年，克里昂米尼一世入侵了阿哥斯。前490年，克里昂米尼一世被关入监狱，不久惨死狱中。

Cleomenes (/kliːˈɒmᵻniːz/; Greek Κλεομένης Kleomenes; died c. 489 BC) was an Agiad King of Sparta in the late 6th and early 5th centuries BC. During his reign, which started around 519 BC, he pursued an adventurous and at times unscrupulous foreign policy aimed at crushing Argos and extending Sparta's influence both inside and outside the Peloponnese. He was a brilliant tactician. It was during his reign that the Peloponnesian League came formally into existence. During his reign, he intervened twice successfully in Athenian affairs but kept Sparta out of the Ionian Revolt. He died in prison in mysterious circumstances, with the Spartan authorities claiming his death was suicide due to insanity.