Miss Earth 2018, the 18th edition of the Miss Earth pageant, with the theme "Goddesses of the Earth", was held on November 3, 2018, at the Mall of Asia Arena in Pasay, Metro Manila, Philippines. Karen Ibasco of the Philippines crowned her successor Nguyễn Phương Khánh of Vietnam at the end of the event. This is the first time Vietnam won the Miss Earth pageant, one of the Big Four international beauty pageants. On October 20, 2018, Miss Earth announced in their Facebook page that the winners of Eco-Video and Eco-Media Award winners automatically fast-tracked to the Top 18; the two delegates who earned two spots through the preliminary panel of judges and by the votes of social media.

Miss Earth is an annual international major beauty pageant based in the Philippines that advocates for environmental awareness, conservation and social responsibility. Along with Miss World, Miss Universe, and Miss International, it is one of the Big Four beauty pageants.