Unknown men kidnapped a Bangladeshi development worker about 50 kilometres south of the Afghan capital Kabul.
It was not clear who kidnapped the man from the Bangladesh Rural Advancement Committee (BRAC) on Saturday in the province of Logar, the man's organisation told AFP on Sunday.
The insurgent Taliban movement, which has captured several foreign nationals, could not immediately be reached for comment.
"Six persons entered the office and forcefully took him away," the head of BRAC's mission in Afghanistan, Gundu Kumar Roy, told AFP.
"We could not contact him because he left his mobile on the table. No one has contacted us."
He said BRAC was contacting Afghan authorities for help.
BRAC has been in Afghanistan since 2002 and works on development projects, including building schools, roads and clinics.
Its microfinance programmes in Afghanistan work largely with poor and disadvantaged women.
Another of its Bangladeshi staff was shot dead in remote northeastern Afghanistan on Wednesday.