Docimium, Docimia or Docimeium (Greek: Δοκίμια and Δοκίμειον) was an ancient city of Phrygia, Asia Minor where there were famous marble quarries. It remains a Roman Catholic titular see.
This city, as appears from its coins – which bear the epigraph Δημος or Ιερα Συνκλητος Δοκιμεων Μακεδονεν – where the inhabitants are called Macedonians, may have been founded by Antigonos Dokimos. The city's name in Greek is Romanized as Dokimeion, Dokimia Kome, Dokimaion, and later Dokimion.
Strabo places Docimium somewhere about Synnada: he calls it a village, and says that there is there a quarry of Synnadic stone, as the Romans call it, but the people of the country call it Docimites and Docimaea; the quarry at first yielded only small pieces of the stone, but owing to the later efforts of the Romans large columns of one piece are taken out, which in variety come near the Alabastrites, so that, though the transport to the sea of such weights is troublesome, still both columns and slabs were brought to Rome of wondrous size and beauty. The red colors which streaked the white marble taken from the city's holy mountain were attributed to the drops of blood from the dying god Attis. The word Docimaea (Δοκιμαίαν) in this passage of Strabo appears to be corrupt. It should be either Δοκιμαῖον or Δοκιμέα.