Smiling Dolphinrefers to memes and jokes about a photo of a "Yangtze Finless Porpoise," a kind of endangered riverdolphinfound in the Yangtze River in China. A photo of the dolphin's head, where it appears to be smiling, became areaction memeon X (formerly Twitter) in September 2024. The photo likely originates from the Miyajima Public Aquarium in Japan.