Nominations include head the Environmental Protection Agency, homeland security chief, head the Small Business Administration and the US ambassador to China.
President-elect Donald Trump continues to build his Cabinet as he prepares to take office on January 20. positions in his administration.
Trump announced on Wednesday his nomination of a fossil fuel industry defender as his top environmental official, another retired general as homeland security chief and Iowa's governor as US ambassador to China.
The president-elect said Oklahoma Attorney General Scott Pruitt, 48, would be nominated to head the Environmental Protection Agency.
Pruitt sued the EPA in a bid to undo a key regulation under outgoing President Barack Obama that would curb greenhouse gas emissions blamed for climate change, mainly from coal-fired power plants.
Retired Marine Corps General John Kelly
Trump tapped retired Marine Corps General John Kelly, 66, for secretary of the Department of Homeland Security, whose responsibilities include immigration.
Kelly, the third retired general named by Trump to a senior administration post, last year told Congress that a lack of security on the US-Mexican border posed a threat to the United States.
He would work in tandem with Republican Senator Jeff Sessions, Trump's pick for attorney general, who is a leading advocate of cracking down on illegal immigration.
The former four-star general would head a department in charge of securing borders against illegal immigration, protecting the president, responding to natural disasters and coordinating intelligence and counterterrorism.
He formerly headed the Southern Command, responsible for US military activities and relationships in Latin America and the Caribbean. He was a proponent of keeping open the US military prison in Guantanamo Bay, Cuba.
Iowa Governor Terry Branstad
Trump's transition team said Republican Iowa Governor Terry Branstad, 70, who has boasted of close ties to Beijing's leaders, was picked as US ambassador to China.
Branstad has been an eager trading partner with China, helping Iowa sell agricultural goods to the Asian powerhouse. His choice came after Trump rattled the world's second-largest economy with tough talk on trade and a telephone call with the leader of Taiwan.
In addition, transition officials said Linda McMahon, 68, former CEO of professional wrestling company WWE and wife of wrestling kingpin Vince McMahon, was Trump's choice to head the Small Business Administration.
Trump has taken part in WWE events in the past and has close ties to the McMahons. He is a member of the WWE Hall of Fame.
All four posts require Senate confirmation.
Trump previously picked retired Marine Corps General James Mattis as defense secretary and retired Army Lieutenant General Michael Flynn as national security adviser.
Trump has more key appointments to make in coming days, including the high-profile job of secretary of state.
His team said former Republican presidential candidate Mitt Romney, a fierce Trump critic during the campaign, is still under consideration for a diplomatic job.