Therapeutic enzymes are proteins which can be used to treat rare and deadly diseases. They represent a small but profitable market. Therapeutic enzymes are superior to non-enzymatic drugs owing to their high specificity toward the target and also their ability to multiple substrate conversion. They are essential for speeding up all the metabolic processes and many a life-supporting chemical inter-conversions. Actinomycetes including Arthrobacter form an enormous reservoir of secondary metabolites and enzymes. The characterization of L-asparaginase, β-glucosidase, urate oxidase, methionine γ-lyase, acetyl cholinesterase, and arginase activities from actinomycetes Arthrobacter clearly demonstrate the potential of Arthrobacter as potent producer of therapeutic enzymes. These metabolic enzymes can be used either separately or in combination with other therapies for the treatment of several diseases such as leukemia, gout, asthma, and neurological disorders. The objective of this review is to compile the information on the application of therapeutic enzymes produced by Arthrobacter and their future prospects as drugs.