Mandodari (Sanskrit: मंदोदरी, Mandodarī, lit. "soft-bellied";) was the queen consort of Ravana, the king of Lanka, according to the Hindu epic Ramayana. The Ramayana describes her as beautiful, pious, and righteous. She is extolled as one of the Panchakanya, the recital of whose names is believed to dispel sin.

Mandodari was the daughter of Mayasura, the King of the Asuras (demons), and the apsara (celestial nymphs) Hema. She marries Ravana and bears three sons: Meghanada (Indrajit), Atikaya and Akshayakumara. Despite her husband's faults, Mandodari loves him and advises him to follow the path of righteousness. She repeatedly advises Ravana to return Sita to Rama, but her advice falls on deaf ears. Her love and loyalty to Rāvana are praised in the Rāmāyana.

In a version of Ramayana, Hanuman tricks her into disclosing the location of a magical arrow which Rama uses to kill Ravana. Many versions of Ramayana state that after Ravana's death, Vibhishana—Ravana's younger brother who joins forces with Rama, does so on Mandodari's advice.

The Uttara Kanda of the Ramayana mentions that Mayasura visited Svarga (heaven), where the apsara Hema was given to him by the gods. They had two sons, Mayavi and Dundubhi, and a daughter, Mandodari. Later, Hema returned to heaven; Mandodari and her siblings were left with their father.

There are varying accounts of Mandodari's birth. The Telugu text Uttara Ramayana mentions that Mayasura is married to the apsara Hema. They have two sons, Mayavi and Dundubhi, but long for a daughter, so they start performing penances to seek the favour of the god Shiva. Meanwhile, an apsara named Madhura arrives at Mount Kailash, the abode of Shiva, to pay her respects. In absence of his wife Parvati, Madhura makes love with the god. When Parvati returns, she finds traces of ashes from her husband’s body on the breasts of Madhura. Agitated, Parvati curses Madhura and sends her to live in a well as a frog for twelve years. Shiva told Madhura that she will become a beautiful woman and be married to a great valorous man. After twelve years, Madhura becomes a beautiful maiden again and cries out loudly from the well. Mayasura and Hema, who are performing penance nearby, answer her call and adopt her as their daughter. They bring her up as Mandodari. In this version, Meghanada, the son of the demon-king Ravana and Mandodari, is said to originate from the seed of Shiva embedded in Mandodari's body.

In the Telugu Ranganatha Ramayana, Parvati creates a doll, which is turned into a damsel by Shiva. However later, Parvati becomes worried due to the maiden's beauty; Shiva turns her into a frog, who is later turned back to a human and granted to Mayasura as a daughter. In another Telugu tale and the Kuchipudi dance tradition, Ravana asks Shiva for Parvati as his wife. Shiva consents; however Parvati creates a look-alike maiden from a frog and entrusts her to Ravana. Since the woman was created from a frog, she was called Mandodari. In the Ananda Ramayana, Vishnu creates Mandodari from sandalwood paste smeared on his body and rescues Parvati from Ravana by handing him Mandodari as the real Parvati.

The frog motif also reiterated in other stories. The Odia Dharma Purana narrates that the earth sends her son Maninaga to poison their cow's milk of the sages Mandar and Udar, who had denied her the share of the milk. A female frog jumps in the vessel to save the sages. Cursed by the sages for her supposed gluttony, she turns into a beautiful maiden called Vengavati. She has pre-marital coitus with Vali. Ravana demands her hand in marriage from the sages, who refuse. Ravana assumes Vali's form and kidnaps Vengavati. The real Vali and Ravana pull in opposite directions, thereby tearing her apart. As a consequence, Angada (generally described as Tara's son) is born. The death-god Yama and wind-god Vayu resurrect her and is named as Mandodari, after the two sages. Mahari dance tradition narrates a similar tale where a snake poisoned the milk of a hermit; the female frog jumps in the milk and dies to rescue the sage. She is cursed by the hermit in the misbelief of her greed and turns into the beautiful Mandodari.

Ravana comes to the house of Mayasura and falls in love with Mandodari. Mandodari and Ravana are soon married with Vedic rites. Mandodari bears Ravana's three sons: Meghanada (Indrajit), Atikaya and Akshayakumara. Mandore, a town located 9 km north of Jodhpur, is believed to be the native place of Mandodari. Ravana is treated as a son-in-law among some local Brahmins and has a temple dedicated to him here.