Gai Qi (改琦; 1774–1829), courtesy name Bowen 伯蕰, art names Qiliang 七郎 and Yuhu Waishi 玉壶外史, was a poet and painter born in western China during the Qing dynasty. As an artist, he was active in Shanghai. His paintings mainly concerns plants, beauty, and figures. However, he also did numerous landscapes. In poetry, he preferred the rhyming ci form and added such poems to his paintings.

His social circle included prominent literati as well as artists. He organized both a literary society and a Buddhist lay society. His work often used a delicate baimiao (outline) style, which can be clearly seen in his illustrations for the novel, Dream of the Red Chamber. The illustrations are chiefly portraits of the main characters in the novel. Numerous poets, including the renowned woman poet Zhou Qi, wrote poems to accompany the illustrations.

The scholar Wang Qisun (王岂孙) commissioned Gai Qi to paint an album of famous Chinese women, both historical and legendary. Wang's second wife, Cao Zhenxiu, wrote poems about the women and produced the calligraphy in the album. Gai took as a student the talented woman painter and poet Qian Shoupu (錢守璞) (c. 1801–1869). He was associated with the painter Fei Danxu in what has been called the "Gai Fei" school. Gai's grandson continued the tradition of the Gai Fei school, along with the descendants of Fei Danxiu. He is perhaps best-known today for the Hongloumeng tiyong, a book of portraits of characters in the Dream of the Red Chamber, accompanied by poems about the characters.

Gai's work is held in the permanent collections of many museums worldwide, including the Metropolitan Museum of Art, the Los Angeles County Museum of Art, the Johnson Museum of Art, the Palace Museum, the British Museum, the University of Michigan Museum of Art, the Museum of Fine Arts, Boston, the Princeton University Art Museum, and the Indianapolis Museum of Art.

改琦（1773年 - 1828年），字伯蘊，號香伯，一號七薌，又號玉壺外史，江蘇華亭（今上海市松江區）人，祖籍北京宛平，是清代中期的畫家。

先世為西域（今新疆）人，元朝始入中原，清代定居華亭（今上海），祖父改光宗曾任壽春鎮總兵。改琦體若多病，多才多藝，尤善繪畫，其人物畫被認為是嘉道後最工者，長大後，結交地方名人，如王芑孫、李廷敬等，與費丹旭並稱「改費」。其畫受李公麟、趙孟頫、唐寅、陳洪綬等影響，花草竹等畫也擅長。曾繪《紅樓夢圖》。道光八年（1828年）三月卒，終年五十六歲。

改琦有詩才，又號三十六陂詞客，著有《玉壺山房詞選》二卷、《硯北書稿》一卷、《茶夢庵隨筆》二卷。

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