Due to inherent characteristics of magnesium alloys, such as their lightweight nature, biodegradability, and relatively low susceptibility to corrosion in human bodily fluids, they are often considered a desirable option to produce miniaturized components. Milling is a distinct machining technique that involves intermittent cutting, setting it apart from other procedures like grinding and turning. Consequently, it has diverse impacts on the machinability of modern materials. Hence, the present study focuses to analyze the machinability characteristics of the AZ31B magnesium alloy during micro-milling without the use of any lubrication. Experiments are being undertaken at different cutting parameters, to investigate their effects on cutting forces and surface roughness during micro-milling of AZ31B magnesium alloy. Three levels of spindle speed and feed are being varied at a fixed depth of cut (i.e., 0.1 mm), while machining with both the uncoated and AlTiN-coated carbide end mill cutters. The diameter of micro end mills is 0.5 mm having two flutes which are used as a cutting tool. The current study considers spindle speeds of 20000, 40000, and 65000 rpm, with three distinct feeds of 0.5, 2, and 4 μm/tooth, as cutting parameters.