Ban called for respect for the constitutional order and democratic rule, a statement issued here Sunday by Ban's spokesman said.
Lesotho's Prime Minister Tom Thabane Saturday confirmed a military coup in his country, saying he had fled to neighbouring South Africa, according to Xinhua.
Lesotho has seen a series of military coups since its independence in 1966.
The UN secretary-general welcomed earlier efforts by the South African Development Community (SADC), the Commonwealth and other partners of Lesotho to support the restoration of trust among the members of the coalition government and urged all parties to continue to play an active role in the promotion of peace in Lesotho, the statement said.
"He reaffirms the continued support of the United Nations to these efforts," the statement added.
The situation in the southern African country remains unclear after a possible military coup that sent Thabane into hiding.
Military personnel seized a number of government buildings Saturday.
But the military has denied seeking to oust the prime minister and said its soldiers have returned to the barracks.
Lesotho has been governed by an unstable coalition for two years, with the military and police being loyal to different political parties.