Gelitin (stylized in lowercase as gelitin) is a group of four artists from Vienna, Austria. The group was formerly known as Gelatin, and changed their name in 2005. They are known for creating art events in the tradition of Relational Aesthetics, often with a sense of humor.

One of Gelitin's best known art projects occurred in March 2000, during a six-month tenure in a vacant space in the former World Trade Center (WTC), secured through a Lower Manhattan Cultural Council program for artist residencies. The group removed one of the windows on the 91st floor of the North Tower and temporarily installed a narrow balcony, while a helicopter flew around the scene, taking photographs for their book The B-Thing. The book was published in 2001 and had even by that time taken on an air of urban legend.

Another of their projects is a gigantic plush toy: a 55-metre (180 ft) reclining pink Bunny installed on Colletto Fava (near Genoa, Italy), intended to remain there until 2025.

In November 2005, the group had a show at Leo Koenig, Inc. in New York, a project called Tantamounter 24/7. The artists called their project a "gigantic, complex and very clever machine", which functioned as a kind of art-copier. The group erected a barrier blocking off one half of the space, locking themselves inside for one week. They asked visitors to insert items that they wanted copied into an opening through the barrier; hand-made copies were later returned through another opening.

Other works include: