西亚两河流域古代王朝。公元前16世纪由加喜特人，克喜特人，喀西特人 （Kassites)建立。又称加喜特巴比伦、巴比伦第三王朝。
加喜特人原居于札格罗斯山脉中部。公元前16世纪初占据巴比伦，建加喜特王朝。此时约当阿古姆二世时期。布尔纳布里亚什二世至卡什提里亚什四世期间（约前14世纪中～前13世纪后半），为其繁荣时期，与埃及新王国、赫梯帝国、亚述同为并立的大国。公元前13世纪后半期，亚述人和埃兰人入侵。约公元前1157年，加喜特王恩利尔纳丁·阿基被埃兰人拐走，加喜特王朝灭亡。
加喜特人在入主两河流域后，将侵占的土地分配给本族的朝臣、贵族和官吏，形成大地产私有主。其政治体制基本上是贵族政治，后期地方贵族势力日趋强大，王权削弱。加喜特人恢复了两河流域的秩序、和平和统一，特别是在其统治的中后期，社会经济有所发展，巴比伦、尼普尔、西巴尔等城市经济相当繁荣。人们在两河流域推广用于牵引的马和战车，并在建筑物上以砖刻浮雕代替石雕。这一风格为以后的新巴比伦王国和阿契美尼德王朝所继承。
加喜特人全面接受两河流域固有的文化、宗教和阿卡德语言文字，迅速塞姆化。其国王重建和修饰尼普尔、拉尔沙、乌尔、乌鲁克等地的神庙。这一时期的重要遗物“界碑”，实际是国王所授地产的凭证。史称此时为界碑时代，即得名于此。界碑的右面或上部刻神像或神的象征，如以圆盘象征太阳神沙马什，以月牙象征月神欣，以锄头象征马尔杜克等；左面或下部的铭文多为王授土地情况。
The Kassite dynasty was founded by Kandis or Gandash of Mari. The Kassites renamed Babylon "Kar-Duniash", and their rule lasted for 576 years. This foreign dominion offers a striking analogy to the roughly contemporary rule of the Hyksos in ancient Egypt. Babylonia having lost its empire over western Asia, the high-priests of Ashur made themselves kings of Assyria. Most divine attributes ascribed to the Semitic kings of Babylonia disappeared at this time; the title of God was never given to a Kassite sovereign. However, Babylon continued to be the capital of the kingdom and the 'holy' city of western Asia, where the priests were all-powerful, and the only place where the right to inheritance of the old Babylonian empire could be conferred.
Despite the loss of territory, and evident reduction in literacy and culture, the Kassite dynasty was the longest-lived dynasty of Babylon, lasting until 1155 BC (short), when Babylon was conquered by Shutruk-Nahhunte of Elam, and re-conquered a few years later by Nebuchadrezzar I, part of the larger Bronze Age collapse.