The Tunisian government is sending two military aircraft to deliver food supplies, medicine and medical equipment to Lebanon's capital Beirut.
It's to help after an explosion, which shook the whole city on Tuesday, killed at least 113 people and injured more than 4,000 others.
Lebanon's President Michel Aoun said the blast was caused by 2,750 tonnes of ammonium nitrate, which is used as a fertiliser and an explosive, stored unsafely in a warehouse at the port.
Tunisia is among a number of countries who have offered humanitarian assistance to Lebanon.
The French president, Emmanuel Macron, who is travelling to Lebanon on Thursday, is sending three planeloads of rescuers and relief supplies to the country.
Paris's mayor says the Eiffel Tower's lights will be switched off from midnight, in solidarity with Beirut.
Turkey, Iran, Qatar and Russia and the European Union, are all sending humanitarian supplies.
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