Vincent Anselmo Gironda was an American professional bodybuilder, personal trainer, author, co-founder of the supplement company NSP Nutrition, and owner of the celebrity-frequented Vince's Gym. His nickname was the "Iron Guru".

Gironda was born in The Bronx, New York. While he was still a young child, the family moved out west to Los Angeles when his father, a stuntman, was offered work in the upcoming Ben Hur film. Vince tried his hand at being a stuntman as well but when he saw a photograph of John Grimek, he realized he needed more physical development and began lifting weights at the age of 22.

The first gym he trained at was the local YMCA. He was there for approximately eight months before moving to the Easton Brothers' gym. The Easton brothers taught him to be one of their instructors. He worked there and experimented with training protocols before opening his own gym in North Hollywood, California in 1948 called Vince's Gym.

Gironda promoted a low-carbohydrate high-fat diet and invented a diet known as the "Steak and Eggs Diet". He ate butter, cream, eggs, milk and red meat in high quantities and only a small amount of carbohydrates. His dietary views are mentioned in his book Unleashing the Wild Physique, published in 1984.

He recommended the use of numerous supplements, including desiccated liver tablets, free form amino acids, 225 mcg kelp tablets, Vitamin C tablets, digestive enzymes and raw glandular such as adrenal and orchic tablets. In certain circumstances, Gironda would recommend up to three dozen fertile hen-eggs a day, along with raw (unhomogenized, unpasteurized) cream or half-and-half milk. Large amounts of fertile eggs, he said, are equal to the anabolic steroid Dianabol in effectiveness. However, he was vehemently against the use of steroids for physique development, claiming that they contributed to a grotesque appearance. Although Gironda was not a vegetarian, he endorsed a lacto-ovo vegetarian diet for his bodybuilding vegetarian readers.

In the 1970s Vince wrote countless articles for Iron Man, managed his mail-order business, started a nutrition supplement company (NSP Nutrition) and authored his own training and nutrition manuals, all the time still operating his gym.

In the 1980s, a book was published with the collaboration of MuscleMag International publisher Robert Kennedy titled "Unleashing the Wild Physique". It contained considerable knowledge Vince gathered and tested throughout his 30+ year career. The release of the book prompted a promotion tour where the Iron Guru gave sold-out seminars throughout the US and Canada.

Gironda died on October 18, 1997, in Ventura County, less than a month before his 80th birthday.