Bamboo leaves are rich in phenolic compounds (PC), which may exhibit antioxidant potential. This study investigated the influence of different drying temperatures (40, 50, and 60°C) on the PC content and antioxidant capacity of leaves from the species Dendrocalamus asper. After drying, the leaves were ground and extracted with methanol in an ultrasonic bath, centrifuged, and transferred to 25 mL flasks. The re-extraction process was repeated 3 times, totaling 100 mL. For PC separation and quantification by liquid chromatography coupled with mass spectrometry, the extracts were filtered through a 0.22 μm PTFE filter. The mobile phases used were: water acidified with 0.5% acetic acid and acetonitrile. The results were expressed in mg of PC/100 g of dry leaf (DL). The antioxidant capacity was then assessed using the ORAC assay, and the results were expressed in mmol of Trolox/100 g DL. The analyses were performed in triplicate, and Tukey's test was used for significant differences (p < 0.05). The PC content varied depending on the temperature, with 50 and 60°C showing the highest PC levels: 283.40±16.42 and 293.68±21.91, respectively, with no significant difference between them. In both, the major PCs were flavones: orientin, O-xylosyl-isovitexin, and 6-C-arabinosyl luteolin, accounting for approximately 80% of the total PC content. The 40°C temperature showed lower PC levels (172.17±7.44), but flavones remained the dominant class. Antioxidant capacity did not differ statistically across all temperatures, with an average of 16.57±1.20. It can be concluded that the 50 and 60°C drying temperatures resulted in higher PC content, likely due to shorter drying times. Regarding antioxidant capacity, there was no significant difference between the temperatures, suggesting other important components may influence this activity.