Ptah (/tɑː/ TAH; Ancient Egyptian: ptḥ, reconstructed [piˈtaħ]; Ancient Greek: Φθά, romanized: Phthá; Coptic: ⲡⲧⲁϩ, romanized: Ptah; Phoenician: 𐤐𐤕𐤇, romanized: ptḥ) is an ancient Egyptian deity, a creator god, and a patron deity of craftsmen and architects. In the triad of Memphis, he is the husband of Sekhmet and the father of Nefertem. He was also regarded as the father of the sage Imhotep.

Ptah is an Egyptian creator god who conceived the world and brought it into being through the creative power of speech. A hymn to Ptah dating to the Twenty-second Dynasty of Egypt says Ptah "crafted the world in the design of his heart," and the Shabaka Stone, from the Twenty-Fifth Dynasty, says Ptah "gave life to all the gods and their kas as well, through this heart and this tongue."

He bears many epithets that describe his role in ancient Egyptian religion and its importance in society at the time:

Like many deities of ancient Egypt he takes many forms, through one of his particular aspects or through syncretism of ancient deities of the Memphite region. Sometimes represented as a dwarf, naked and deformed, his popularity would continue to grow during the Late Period. Frequently associated with the god Bes, his worship then moved beyond the borders of Egypt and was exported throughout the Eastern Mediterranean. Through dissemination by the Phoenicians, we find figures of Ptah in Carthage.

Ptah is generally represented in the guise of a man with green skin, contained in a shroud sticking to the skin, wearing the divine beard, and holding a sceptre combining three powerful symbols of ancient Egyptian religion:

These three combined symbols indicate the three creative powers of the god: power (was), life (ankh) and stability (djed).

From the Old Kingdom, he quickly absorbs the appearance of Sokar and Tatenen, ancient deities of the Memphite region. His form of Sokar is found contained in its white shroud wearing the Atef crown, an attribute of Osiris. In this capacity, he represents the patron deity of the necropolis of Saqqara and other famous sites where the royal pyramids were built. Gradually he formed with Osiris a new deity called Ptah-Sokar-Osiris. Statuettes representing the human form, the half-human, half-hawk form, or simply the pure falcon form of the new deity began to be systematically placed in tombs to accompany and protect the dead on their journey to the West.

His Tatenen form is represented by a young and vigorous man wearing a crown with two tall plumes that surround the solar disk. He thus embodies the underground fire that rumbles and raises the earth. As such, he was particularly revered by metalworkers and blacksmiths, but he was equally feared because it was he who caused earthquakes and tremors of the Earth's crust. In this form also, Ptah is the master of ceremonies for Heb Sed, a ceremony traditionally attesting to the first thirty years of a pharaoh's reign.