Keywords: Acehnese, Pidie dialect, Monophthong, Oral vowel, Acoustic Analysis This acoustic study aims at finding out the characteristics of monophthong oral vowels of an Acehnese dialect, spoken in Pidie. This study recording ten females of Pidie dialect speaker that is chosen through purposive sampling to produce ten target vowels. The language consultants were given list of word, which is adapted from Pillai & Yusuf (2012), those words were elicited in CVC word form where the consonant is stop or fricative and uttered using carrier sentence with three times of repeatation. A total of 300 tokens of the vowels were obtained and analyzed using PRAAT version 6.0.19 (Boersma & Weenink, 2016), the acoustic cues, F1 and F2 are analyzed to identify the vowels’ quality. The results for the monophthongs generally similar to Pillai & Yusuf (2012) findings on North Aceh dialect. Based on the vowel quality measurement, it is found that the vowels; /e/, /ε/, /ɯ/, /ə/, /ᴧ/, /a/, /u/ and /o/ produced by Pidie dialect speakers have lower frequency. Moreover, the vowel /ɔ/, /o/, / ɯ/, /ə/, /u/ produced to be more fronted while vowel /ᴧ/ produced more back. Meanwhile, the vowel /i/ does not have any significant differences than the standard Acehnnese.