Ran In-ting (Chinese: 藍蔭鼎; 1903–1979), also known as Lan Yinding, was a Taiwanese watercolour artist whose work is recognised around the world for its expressive rendition of Taiwan's landscape.

His father, a xiucai scholar of Qing China, is said to have taught Ran Chinese ink painting as a child.

At this time, Taiwan was a colony of Japan, having been ceded to the Japanese by Qing dynasty China under the 1895 Treaty of Shimonoseki, at the end of the Sino-Japanese war.

Ishikawa had studied in England, and taught his students to paint in watercolours in the Western style, which was seen as very important in Japan at that time.

Ran successfully exhibited at the Imperial Fine Arts Academy exhibitions in Japan, the Teiten, in 1926 and 1929, and also in 1929, probably owing to Ishikawa's influence with the colonial administration, was appointed as Art teacher at Taihoku First Girls High School and Taihoku Second Girls High School.