Marcelino de Unceta y López (October 22, 1835 – March 10, 1905) was an artist, illustrator, and painter of Zaragoza and Madrid. Unceta produced historical paintings, especially those of military history, as well as illustrating sketches and posters meant for advertising. He is known for creating in 1879 what is considered the first poster for a bullfight. His memorable drawings of horses and bulls in his posters made him a well-known artist in Spain of the time.
Unceta was born in Zaragoza in 1835. He started his artistic education at the Zaragoza School of Fine Arts in 1850, and continued his training at the Madrid School of Fine Arts. Unceta began work as an illustrator for the newspapers. In 1879, he produced his first poster for a bullfight, the art that would give him later fame. He also collaborated in the workshop with his Huescan friend Eduardo Portabella on lithography. Another notable work was Unceta's design of the curtain of the Teatro Principal of Zaragoza circa 1877, which can be seen today in its original location. It illustrates allegorical figures of the muses of drama, who are linked to drawings of famous Spanish authors and actors of the time.