in Mesopotamian mythology, twin deities, the first gods to be born from the chaos that was created by the merging of Apsu (the watery deep beneath the earth) and Tiamat (the personification of the salt waters); this is described in the Babylonian mythological text Enuma elish (c. 12th century BC).

Usually, Lahmu and Lahamu represent silt, but in some texts they seem to take the form of serpents, and, because the wavy line of a gliding snake is similar to the ripple of water, some scholars believe that Lahmu and Lahamu may have been only synonyms of Tiamat. Lahmu and Lahamu were rather vague deities who do not seem to have played any significant part in subsequent myths, although they may have been the progenitors of Anshar and Kishar.