Irving Block (1910-1986) was a painter, illustrator, muralist, writer, and professor known for his work in Hollywood movies with visual effects, his authorship of the story behind the film Forbidden Planet, his work as a professor in academia, and his artwork. His daughter is the writer Francesca Lia Block.

Irving Alexander Block was born on December 2, 1910, in New York City. He pursued his education at New York University, where he earned a Bachelor of Science degree, and later continued his artistic studies at the National Academy of Design. During the 1930s, Block became involved with the Works Projects Administration's Federal Art Project, a New Deal initiative aimed at supporting artists during the Great Depression.

In the 1940s, Block relocated to California, where he began his career in Hollywood. He joined 20th Century Fox as a matte shot artist, contributing visual effects and designs for various films. Block worked primarily on low-budget science fiction and horror films, and developed the skills to create special effects using paintings and models. One of his most notable achievements was writing the original story for the 1956 film Forbidden Planet, a classic in the science fiction genre. He is also credited with co-designing Robby the Robot, the iconic character from the same film.

Over the years, Block contributed to numerous films, including Macabre, Kronos, The Caretakers, Alice in Wonderland, Atomic Submarine, Daniel in the Lion's Den, David and Goliath, The Exiles, The First Murder, Flight to Mars, From Caveman to Spaceman, Goya, Judgement of Solomon, Ripley's Believe it or Not, Stranger in my Skull, The Tower of Babel, and Venus and Adonis.

In addition to his work in Hollywood, Block maintained an active career as a painter, illustrator, and muralist. In the 1960s, he exhibited his work in several Los Angeles-area art galleries. His exhibits received mostly favorable reviews from critics.

From 1963 to 1980, Block was a professor in the art department at California State University, Northridge (CSUN). After retiring from teaching, Block collaborated with the Santa Susana Press, published by the Oviatt Library at CSU Northridge, where he illustrated numerous fine press books in the 1970s and 1980s.

Irving Block was married to the poet Gilda Block, also known as Jill Block. The couple had a son, Gregg, and a daughter, Francesca Lia Block, who became a successful writer known for her Weetzie Bat series. Block continued to create and contribute to artistic projects until his death on May 3, 1986, in North Hollywood, California.

Block's personal and professional papers are archived at the Smithsonian Institution and at California State University, Northridge.