In the realm of chemistry, OMCs are an intriguing and significant topic. OMCs are classified into three categories: sigma-bonded, π-bonded, and σ- and π-bonded metal carbonyl compounds. The characteristics of OMCs as solubility, bonding type (ionic or covalent), stability, reactivity, and existence are emphasized. Applications of OMCs are highlighted. Numerous applications of OMCs are due to the distinctive array of properties and reactivities that result from the intricate interplay between metal atoms and organic ligands. The distribution of OMCs among different elements in the marine environment is tracked in this chapter, focusing on their stability. Many OMCs were identified as environmentally persistent, easily concentrated, highly toxic (often more hazardous than their original form), and degrading at a slow rate. Academics, industrial scientists, ecologists, and environmentalists who work with organometallic compounds (OMCs) will find this chapter to be a helpful guide. It covers the subject either as a stand-alone review or in the sequence of the topic area.