In machining processes, MQLmethod is substantially preferred in terms of sustainable production because oflower usage of cutting fluid and better cutting performance in comparison withtraditional techniques. On the other hand, it is also critical that the cuttingfluid used is not hazardous to human and environmental health. In the presentstudy, we aimed to investigate the cutting performance of AISI O2 steel in thepresence of the cutting fluid containing various amounts of environmentallyfriendly Nano hexagonal boron nitride (Nano h-BN) based ethylene glycol (EG) byminimum quantity lubrication (MQL) method. Nano h-BN at 1% and 2% percentage byvolume was added to the ethylene glycol and sonication was carried out for onehour for both prepared cutting fluids. Based on the experimental results usingprepared cutting fluids, the highest cutting tool life was obtained in testsusing 2% h-BN containing cutting fluid with 2.4 m cutting length. Theimprovement in tool life was approximately 46% using 2% h-BN containing cuttingfluid compared to using 1% h-BN containing cutting fluid in milling tests. 2%h-BN containing cutting fluid compared to dry conditions in terms of tool life,the increase was approximately 78%. The improvement in surface roughness valuemeasured on milled surface of workpiece material was approximately 60% using 2%h-BN containing cutting fluid compared to dry conditions. Compared to using 1%h-BN containing cutting fluid the improvement in surface roughness values wasapproximately 46%. A reduction in the cutting forces measured by the increasedh-BN ratio in the prepared ethylene glycol based cutting fluid has occurred. Asa result of SEM images and EDS analysis of worn tools, it was observed that thedominant wear mechanism was abrasion in all applied tests.