Intermetallic Compounds in Mercury is Volume 51 of the Solubility Data Series. It follows Volume 25, Metals in Mercury, of the same series. Evaluations of more than fifty systems are presented together with all of the data and citations from the original literature. In addition, over 200 references are given to related literature that describes metal interactions in amalgams but from which quantitative information can only be inferred. For each compound reported, a critical evaluation presents recommended or tentative values of solubilities or solubility products based on statistical treatment of the data reported. Mercury provides a unique solvent for metal-metal reactions, and thus the data reported here are a valuable addition to the experimental basis for better fundamental understanding of interactions of metals in the elemental state. In addition, this material is important technologically in the areas of metal processing, materials, and electrochemistry.