A 44-year-old South African stands accused of smuggling cocaine into Namibia from Brazil.
Michael Mpangala appeared in the Katutura Magistrate's Court on Tuesday.
Namibian police spokesperson, deputy commissioner Kauna Shikwambi, told News24 that Mpangala was arrested on Sunday afternoon at the Hosea Kutako International Airport.
Shikwamba said customs officials scanned Mpangala's luggage and found 10kg of cocaine, with an estimated street value of over R5 million.
"The suspect was allegedly coming from Brazil to deliver drugs to allegedly an unknown person in Namibia," said Shikwamba.
He said Mpangala was also found with 224 224 Brazilian reais (about R700 000) in cash.
Mpangala was expected to appear in court for a bail application on 16 January.