İslâm III Giray (Crimean Tatar: اسلام كرای ثالث, romanized: İslâm Gäray-i S̱âlis̱; 1604 – 10 July 1654) was khan of the Crimean Khanate for ten years (1644–1654), interrupting the reign of his brother Mehmed IV Giray.

İslâm went to Turkey and settled at a place called Sultania on the western side of the Dardanelles.

In 1651 Kyrym was killed at the Battle of Berestechko and was replaced by Gazi, the new nureddin being İslâm's younger brother Adil.

[3] In 1651 the Poles sent a large army and won the Battle of Beresteczko because the Tatars fled the field.

In 1652, following the Battle of Batih, the Cossacks purchased the Polish prisoners from the Tatars and slaughtered them.

Howorth says that in 1653 İslâm ravaged the country around Bar and Kaminetz and left after receiving a ransom.

In January 1654, by the Treaty of Pereyaslav, the Cossacks accepted Russian supremacy, thereby provoking the Russo-Polish War (1654–1667).