The current work investigates the chemodiversity, in vitro antioxidant, α‐amylase and α‐glucosidase inhibitory potential of Cinnamomum tamala leaf essential oil collected from different localities of East Khasi Hills District of Meghalaya, India. Gas chromatography‐mass spectrometry (GC‐MS) analysis of all the extracted leaf essential oils facilitated the identification of several compounds in a variable range along with eugenol as the major component (74.79‐95.12 %). CT8 exhibited the highest antioxidant activity (IC50 = 11.23 ± 0.27 μg/mL for DPPH and IC50 = 21.54 ± 0.37 μg/mL for ABTS) among all the evaluated EO compounds. The results showed that the FRAP and ORAC values for CT8 were 83.26 ± 1.92 µM trolox/g oil and 70.29 ± 1.90 ascorbic acid equivalents (AAE)/g of oil. α‐amylase and α‐glucosidase inhibition were highest in sample CT8 with IC50 values of 3.62 ± 0.42 µg/mL and 16.29 ± 0.32 µg/mL respectively. Caryophyllene, cyclohexene, 1, 5, 5‐trimethyl‐6‐(2‐propenylidene), germacrene D and eugenol showed strong binding potential toward α‐amylase and α‐glucosidase. It concluded that the chemodiversity and antidiabetic potential of C. tamla oil from Khasi Hills have never been studied. It can be taken as a dietary supplement as an antioxidant and antidiabetic to control blood glucose.