This frontier article covers the recent advancements in ruthenium complex catalysed decarbonylation reactions of different types of carbonyl compounds and provides a direction towards the mechanistic understanding. The mechanistic pathways provide new strategies for the use of appropriate ruthenium-catalysts, increase the substrate scope, and help in the synthesis of new complexes having multiple functionalities. The content of the article is categorized on the basis of the use of substrates. The new challenges of the decarbonylation reaction depend on the development of new ruthenium-catalysts and the efficiency of the catalytic cycles. Therefore, this short review will give an overall idea about the progress in the field of ruthenium-complex catalysed decarbonylation, catalytic pathways, synthetic applications, and utilities of their products and side products.