Phantastes: A Faerie Romance for Men and Women is a fantasy novel by Scottish writer George MacDonald, first published in London in 1858. It was later reprinted in paperback by Ballantine Books as the fourteenth volume of the Ballantine Adult Fantasy series in April 1970.

The story centres on the character Anodos ("pathless", or "ascent" in Greek) and takes its inspiration from German Romanticism, particularly Novalis. The story concerns a young man who is pulled into a dreamlike world and there hunts for his ideal of female beauty, embodied by the "Marble Lady". Anodos lives through many adventures and temptations while in the other world, until he is finally ready to give up his ideals.

The tale starts the day after Anodos' twenty-first birthday. He discovers an ancient fairy lady in the desk that he inherited as a birthright from his late father. After the fairy shows him Fairy Land in a vision, Anodos awakes the next day to find that his room is transforming into a forest, which he soon finds to be Fairy Land itself.

Anodos then encounters a woman and her daughter in a cottage who warn him about the evil Ash Tree and the Alder Tree. He is told that the spirits of trees can leave their tree-hosts and wander throughout Fairy Land. He then explores the world of the fairies, which live in flowers. He then has a nightmarish encounter with the spirit of the Ash Tree, escapes, and finds rest in the warmth and love of the Beech Tree's spirit.

After this, he finds a marble statue by Pygmalion. After he sings to it, the statue flees from him. He pursues the Marble Lady, but finds instead the Maid of the Alder Tree in disguise. The Maid deceives Anodos into letting his guard down so the Ash can attack. He narrowly escapes doom, being saved by the knight Sir Percivale. Anodos then meets a woman and her daughter who believe in fairy tales and the magic of Fairy Land, despite the disbelief of the woman's husband. Anodos also finds his shadow, an evil presence that follows and torments Anodos throughout the rest of the story.