Arthur A. (Art) Pinajian (Armenian: Արթուր Փինաջյան; March 28, 1914 – August 18, 1999) was an Armenian American artist and comic book creator, He was active as a comic book creator from the late 1930s throughout the 1950s, during the Golden Age of Comic Books, and as an artist from the 1950s until his death in 1999. He was a member of the Eisner-Iger Studio in 1938-39 and of Funnies, Inc. in 1939-42. Pinajian created the Quality Comics characters Madame Fatal and the Invisible Hood, also known as Hooded Justice and Invisible Justice.

Pinajian worked on many 1930s Centaur Publications titles and features, including 'Captain Juan', 'Egbert the Great', and 'Tim Roberts'. He subsequently joined Funnies Inc. Pinajian also drew 'Captain Terry Thunder' for Fiction House, 'Inspector Bancroft' for Fox Comics, 'The Wasp' for Lev Gleason Publications, and 'Jungle Terror' for Timely Comics. He was a regular at Quality Comics with 'Hooded Justice', 'Invisible Justice', 'Madam Fatal' and 'Reynolds of the Mounted'. In the 1950s he worked on Western stories for Atlas/Marvel.

He served in the U.S. Army in World War II and received the Bronze Star Medal for valor.

Pinajian also painted portraits, landscapes and some abstract works. He has been cited for his work in the field of abstract expressionism. A collection of Arthur Pinajian's work, discovered in 2007, generated interest in the art community. A gallery exhibit of the paintings was presented in March 2013.

At the first gallery exhibit, one painting sold for $100,000, so far the highest price paid for one of Pinajian's paintings. Thomas Schultz, who helped save the collection, is the full-time registrar. American art historian Peter Hastings Falk is the exhibitions director and chief curator and values the collection at around 30 million dollars.

A 2015 book by Pinajian's cousin Pete Najarian, "The Paintings of Art Pinajian, A Family Story," alleges that Pinajian had verbally left his paintings to Najarian, but left no written will. The book seeks to prove that Pinajian never wanted his work “thrown into the garbage,” as was stated by Falk in his book, Pinajian, Master of Abstraction Discovered, which states, "Pinajian left instructions for his collection to be discarded in the town dump."