Secondo Pia (9 September 1855 – 7 September 1941) was an Italian lawyer and amateur photographer. He is best known for taking the first photographs of the Shroud of Turin on 28 May 1898 and, when he was developing them, noticing that the photographic negatives showed a positive image of the man in the shroud in addition to a clearer rendition of the image. The image he obtained from the shroud has been approved by the Roman Catholic Church as part of the devotion to the Holy Face of Jesus.
Pia was born in Asti, Piedmont, and was an attorney who was also interested in art and science. In the early 1870s he began to explore the new technology of photography, and by the 1890s he was a city councilor and a member of Turin's Amateur Photographers' Club.[1] He became a well known photographer in Turin, and examples of his other photographs are now part of the historical collection at the Turin Cinema Museum.[2] Pia can be considered a pioneer in the field of photography for using electric lightbulbs in the 1890s, as lightbulbs were a novelty in the late nineteenth century, with Thomas Edison's reliable incandescent light bulb having been invented in 1879.