Diogo de Carvalho, SJ (1578 – 22 February 1624) was a Portuguese Jesuit missionary martyred in Edo period Japan.

After entering the Society of Jesus in his hometown in 1594, late in 1600 he arrived, after a long voyage with sixteen other Jesuits, in Goa, India.

In 1609, he arrived in Japan, where, learning Japanese, he was a missionary in the Amakusa Islands, before relocating to Kyōto around 1612.

After the edict of proscription of 1614, in November that year, with seventy-two other Jesuits on three Chinese junks, he was deported to Macau.

Early in 1624, he was martyred in a pit filled with the icy waters of the Hirose River (広瀬川) in Sendai.