Green Henry (German: Der grüne Heinrich) is a partially autobiographical novel by the Swiss author Gottfried Keller, first published in 1855, and extensively revised in 1879.

Truth is freely mingled with fiction, and there is a generalizing purpose to exhibit the psychic disease that affected the whole generation of the transition from romanticism to realism in life and art.

The work stands with Johann Wolfgang von Goethe's Wilhelm Meister's Apprenticeship and Adalbert Stifter's Der Nachsommer as one of the most important examples of Bildungsromane, novels of self-development.

Green Henry details the life of Heinrich Lee from childhood through his first romantic encounters, his fledgling attempts at becoming a painter in Munich, and his eventual installation as a chancery clerk.

The tone of the reminiscences makes it clear that Keller would have the reader understand that Heinrich has lived through and risen out of his instability and irresolution and sees life steadily and cheerfully at last.