Reamker (Khmer: រាមកេរ្តិ៍ [riːəmkeː], also romanized as Ramakerti) is a Cambodian epic poem, based on the Sanskrit's Ramayana epic. The name means "Glory of Rama". It adapts the Hindu ideas to Buddhist themes and shows the balance of good and evil in the world. More than just a reordering of the epic tale, the Reamker is a mainstay of the royal ballet's repertoire. Like the Ramayana, it is a philosophical allegory, exploring the ideals of justice and fidelity as embodied by the protagonists, Prince Rama and Queen Sita. The epic is well known among the Khmer people for its portrayal in Khmer dance theatre, called the L'khaon, in various festivals across Cambodia. Scenes from the Reamker are painted on the walls of the Royal Palace in Khmer style, and its predecessor is carved into the walls of the Angkor Wat and Banteay Srei temples. It is considered an integral part of Cambodian culture.
In the Reamker, issues of trust, loyalty, love, and revenge play out in dramatic encounters among princes and giants, monkeys and mermaids, and a forlorn princess. Though it is understood that Preah Ream is an incarnation of the Hindu god Vishnu, his characteristics and those of the others in the story are interpreted in Cambodia as those of mere mortals, not of the gods as is the case in India. The complex interplay of strengths and weaknesses, though couched in episodes lined with magic, nonetheless represents a decidedly human social behavior.
As in other Southeast Asian countries, the Rama story in Cambodia is not confined to the realm of literature but extends to all Cambodian art forms, from sculpture to dance drama, painting and art. Another epic, Lpoek Angkor Vat (“The Story of Angkor Wat”), which dates from the beginning of the 17th century, celebrates the magnificent temple complex at Angkor and describes the bas-reliefs in the temple galleries that portray the Rama story.
The original Ramayana arrived to Southeast Asia from South India along with Hinduism, but its retelling there suggests Buddhist influence. Intricate carvings on the walls of Angkor Wat depict a scene from the Ramayana dating back nearly a millennium. Statues of the poem's heroes were worshiped in temple sanctuaries, akin to the wall paintings at Cambodia's Royal Palace and Wat Bo. The Ramayana has been an important epic in India for at least two thousand years, and Reamker is its Khmer adaptation. The Cambodian version includes incidents and details not found in the Sanskrit original written by the poet Valmiki. An example of a story that does not appear in Indian texts and performance is that of the encounter between Hanuman, the monkey general, and Sovanna Maccha, the mermaid, a favorite of Cambodian audiences.
The Reamker plot begins with its protagonist, Phreah Ream or Rama, being sent into exile by one of the queen mothers who wanted her own son to inherit the throne. After being sent to the forest, Phreah Ream is joined by his beautiful and faithful wife Neang Seda (Sita), whom the prince won from her father by being the only Prince who successfully completed the father's challenge of firing arrows through a spinning wheel with spokes. Praeh Leak (Lakshmana), the younger brother of Phreah Ream, is concerned about his older brother and joins Neang Seda. 
While entering the forest, Neang Seda and Preah Leak meet the rakshasi Surpanakhar (Surphanakha) who first attempts to seduce Preah Ream, and then Preah Leak. Preah Leak, annoyed by the demon's action, cuts off her ear and nose. The butchered Surpanakhar thirsting for revenge went to her ten-headed brother Krong Reap (Ravana), invincible lord of the island of Lanka. Krong Reap secretly goes to the forest. When he first set eyes on Neang Seda, he was awed by her divine beauty. Krong Reap transforms himself as a golden deer and runs past the party of three. Preah Ream realizes that the deer is not a real deer, however, at Neang Seda's insistence Preah Ream chases it after telling his younger brother to stay and guard his wife. Krong Reap then mimics Preah Ream's voice and calls for his brother to come and save him. Although Preah Leak knows that it is not his brother calling out, he is forced to go at Neang Seda's insistence. However, before he leaves he draws a magical circle around his brother's wife in the dirt that will prevent anything from entering the circle. Krong Reap disguises himself as an old errant and easily tricks Neang Seda's to step outside the circle, after which he abducts her. Preah Ream and Preah Leak return and desperately search for Neang Seda and, in the meantime, they assist the monkey king Sukreep (Sugriva) to destroy his rival Pali Thirat (Vali) and regain his throne. Thanking the two, Sukreep sends the monkey warrior Hanuman to aid them in their search. Hanuman, the son of the wind god, flies out to discover that the demon Krong Reap held Neang Seda prisoner on the island of Lanka.
Hanuman order his soldiers to build a bridge of stone to connect the island Lanka to the mainland. While gathering stones, Hanuman realizes that mermaids were stealing stones to prevent the construction of the bridge. He was roused by this and decides to capture the mermaid princess Neang Machha but falls deeply in love with her. The mermaid likewise falls in love, and thus her mermaid army ceases to tamper in Hanuman's business. The bridge built, Preah Ream and Krong Reap face each other in combat. However, Krong Reap quickly regenerates and damage done to him or any body part that is cut off. It is not until one of Krong Reap's generals defects and discloses the secret to slaying the demon - an arrow in the belly button. With Hanuman's aid, they slay the demon. Preah Ream, victorious in his battles, returns to the capital of Ayuthya and ascends the throne. Preah Ream suspects infidelity as his wife was captive of a very smart and manipulative demon. Trust issues between him and his wife Neang Seda arise after his wife draws a picture of Krong Reap at the insistence of her maid servant (as the demon's true face was said to be the ugliest face there was). Fearing her husband's jealousy, Neang Seda puts the picture under the mattress when she is unexpectedly interrupted. Krong Reap's power extends to the picture and that night spikes grow from it and poke Preah Ream through the mattress. He discovers the picture and believes that it confirms his suspicion that his wife succumbed to Krong Reap's persistent attempts to bed her over the years that she was held prisoner. However, Neang Seda had resisted all Krong Reap's attempts, even that in which Krong Reap transformed himself into her husband. Only his scent had given his disguise away. Preah Ream forces his wife to take the trial of fire to prove she is still pure. Neang Seda passes the test. However, Neang Seda is deeply offended by her husband's lack of trust in her and his lack of belief in her word. She decides to leave and find refuge with Valmiki the wiseman, where she gives birth to twin boys. They met their father and he immediately recognizes who they are and takes them to his palace.
- Preah Ream [preəh riːəm], is the main protagonist of the epic. He is believed to be the reincarnation of the Hindu deity Vishnu and the husband of Neang Seda and the father of two boys.
- Neang Seda [niːəɳ seːda], the female protagonist of the epic and wife of Preah Ream. She gives birth to his two children, but fails to meet happiness at the end of the story. In the epic, she endured the trial of fire.
- Preah Leak [preəh leək], is the brother of Preah Ream and his aid to fight Krong Reap and rescue Neang Seda.
- Krong Reap [kroɳ riːəp] or simply Reap [riːəp], is the main antagonist of the story. He is the brother of Sopphanakha and captured the beautiful Neang Seda to his island of Langka.
- Hanuman, pronounced as [haʔnomaːn], is the Monkey Warrior who helps rescues Neang Seda. While building the bridge connecting the island of Langka to the mainland, he fell madly in love with the mermaid Princess Sovanna Maccha.
- Neang Maccha, is a mermaid princess who tried to spoil Hanuman's plans to build a bridge to Langka but fell in love with him instead and bears his son Mudchanu
- Sugriva is the Monkey King who sent Hanuman to assist Preah Ream.
- Surpanakhar is the sister of Krong Reap. She failed to seduce Preah Leak and loses her ear and nose as a consequence.
- Mahachompoo is the king of the kingdom of Chompoo and helps Preah Ream fight Krong Reap to reclaim Neang Seda with his 18 monkey army
- Angkhut is the cousin of Hanuman and son of Vali. He helps Preah Ream fight Krong Reap.
- Phra Lak Phra Lam
- Hikayat Seri Rama
- Khmer classical dance
- Dance of Cambodia
- Culture of Cambodia
- Greater India
- Kakawin Ramayana
- រឿងរាមកេរ្តិ៍ខ្មែរ និងរ៉ាមគៀនថៃ
- The Reamker — Toni Shapiro-Phim
- The Treasures of Angkor ISBN 88-544-0117-X
- The Reamker