The Book on Mediums, also known as The Mediums Book, was written by Allan Kardec and originally published in 1861. It is the widely respected follow up to The Spirits Book which was published in 1857 and is the second in a series of five books that Kardec wrote that are collectively known as the 'Spiritist Codification'.

The Books on Mediums is intended to be an essential guide to mediumship for mediums and those interested in the spirit world. The book covers the different types of mediumship including, table-turning, incorporation of spirits, haunted houses, transfiguration, apparitions, psychography and telekinesis. It explains how to deal with manifestations and how to guard against frauds, charlatans,