阿拉托斯（Ἄρατος，公元前315或310年─公元前240年），古希腊最具名望的诗人之一，以长诗《物象》(τὰ Φαινόμενα)传世，该诗对研究古代的天文学、气象学具有极大价值。

生于基利家的索里，后来当上马其顿王安提柯二世的宫廷诗人，死于当时的马其顿首都培拉（现属希腊的中马其顿行政区）。他将哲学家欧多克索斯(Εύδοξος)的天文著作改写成韵文《物象》，诗长1,154行，采用六音步格律，大概分为上下两部分，上半描述星座，下半记录气象。这首诗为他赢得了很大名声，在古代流传甚广，不少罗马作家都曾翻译此诗，包括演说家西塞罗、显赫的格马尼库斯(Iulius Caesar Claudianus Germanicus)，连保罗在传道时也曾引用（见〈使徒行传〉17章28节）。

Aratus (/əˈreɪtəs/; Ancient Greek: Ἄρᾱτος ὁ Σολεύς; ca. 315 BC/310 BC – 240 BC) was a Greek didactic poet. His major extant work is his hexameter poem Phaenomena (Φαινόμενα "Appearances"), the first half of which is a verse setting of a lost work of the same name by Eudoxus of Cnidus. It describes the constellations and other celestial phenomena. The second half is called the Diosemeia (Διοσημεῖα "Forecasts"), and is chiefly about weather lore. Although Aratus was somewhat ignorant of Greek astronomy, his poem was very popular in the Greek and Roman world, as is proved by the large number of commentaries and Latin translations, some of which survive.