A horizontal triband of red, white, and red charged with a green Lebanon Cedar centred on the white band.
From The Lebanese Constitution:
(As amended by the Constitutional Law of December 7, 1943)
The Lebanese flag shall be composed of three horizontal stripes, a white stripe between two red ones. The width of the white stripe shall be equal to that of both red stripes. In the center of and occupying one third of the white stripe is a green Cedar tree with its top touching the upper red stripe and its base touching the lower red stripe.