Gaganendranath Tagore was an Indian painter and cartoonist of the Bengal school. Along with his brother Abanindranath Tagore, he was counted as one of the earliest modern artists in India. Gaganendranath Tagore was born at Jorasanko into a family whose creativity defined Bengal's cultural life. His brother Abanindranath was a pioneer and leading exponent of the Bengal School of Art. He was a nephew of the poet Rabindranath Tagore and the paternal great-grandfather of actress Sharmila Tagore.
Gaganendranath received no formal education but trained under the watercolourist Harinarayan Bandopadhyay. In 1907, along with his brother Abanindranath, he founded the Indian Society of Oriental Art which later published the influential journal Rupam. He studied and assimilated Japanese brush techniques and the influence of Far Eastern art into his own work, as demonstrated by his illustrations for Rabindranath Tagore's autobiography Jeevansmriti (1912).
He went on to develop his own approach in his Chaitanya and Pilgrim series. The Modern Review published many of his cartoons in 1917. From 1917 onwards, his satirical lithographs appeared in a series of books, including Play of Opposites, Realm of the Absurd and Reform Screams. Partha Mitter describes him as "the only Indian painter before the 1940s who made use of the language and syntax of Cubism in his painting".