Foreign Minister Alexander Downer said the extra money would particularly benefit children and health services.
He said the latest funding brought Australia's total contribution for the post-conflict reconstruction of Lebanon to $A24 million.
"The majority of the funding will support restoring health infrastructure and providing adequate access to health facilities and services, particularly for vulnerable groups such as women and children," he said in a statement.
Mr Downer said the United Nations Children's Fund (UNICEF) would receive $A5 million of this money for urgently needed recovery programs including restoration of water and sanitation services.
The World Health Organisation will receive $A2.5 million to restore the country's health infrastructure and services.
A further $A7.5 million will be provided for long term reconstruction once the government of Lebanon and international agencies determine needs and priorities later this year.
Mr Downer said this money built on the $A9 million Australia already committed in July and August to support the work of aid agencies in Lebanon.
"Australia remains strongly committed to assisting the government of Lebanon in its recovery efforts," he said.
"I am pleased that hostilities in southern Lebanon have ceased, allowing the Lebanese to rebuild their lives with the help of the international community."
Southern Lebanon was devastated during the month-long Israel-Hezbollah fighting that caused more than $A3.5 billion of damage to infrastructure and services.