The appointment of the new 16-member line-up came after the Gulf state's second parliamentary polls in eight months were again boycotted by the opposition.
Former central bank governor, Sheikh Salem Abdulaziz Al-Sabah, who resigned last year in protest over a huge expansion in public spending, was appointed finance minister.
The outgoing finance minister Mustafa al-Shamali was named oil minister, a post he had held on a caretaker basis over the past few months following the resignation of Hani Hussein.
They control the key ministries of defence, interior and foreign affairs, as well as finance, information and health.
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New interior and defence ministers were appointed from within the ruling family.
Sheikh Ahmad Humoud Al-Sabah was replaced at interior by Sheikh Mohammad Khaled Al-Sabah, who had previously held the post.
Army chief of staff Sheikh Khaled al-Jarrah Al-Sabah replaces Sheikh Ahmad Khaled Al-Sabah at defence.
The ministers of commerce, development, social affairs and labour, education and Islamic affairs were retained. Newly-elected MP Issa al-Kundari was appointed communications minister.
The July 27 vote was boycotted by the Islamist, nationalist and liberal opposition but saw turnout of 52.5 per cent, sharply up on the record low of 40 per cent in the previous election in December.
The new cabinet is Kuwait's 12th since 2006. The emirate has been hit by a series of political crises that have forced 11 cabinets to resign and parliament to be dissolved on six occasions.
Disputes between successive governments and parliament have stalled development in the wealthy Gulf state which has surpluses of around USD 400 billion thanks to high oil prices over the past 12 years.