Hesitations, as vocal phenomena, generally refer to the occurrences of non-fluencies or disfluencies in a person’s oral speech. These non-fluencies are any speech behaviors with interruptions in the “normal” flow or rhythm of speech. Four types of hesitations were identified in this study based on the Maclay and Osgood (1959) schema: (1) Repeats (2) False Starts (3) Filled Pauses and (4) Unfilled Pauses. Several hypotheses were tested to find out whether there are significant differences or relationships between and among the following: (1) frequencies of hesitations in impromptu and extemporaneous public speaking situations; (2) frequencies of hesitations in English and Filipino public speaking performances; (3) frequencies of hesitations of male and female speakers; (4) hesitation phenomena and language with bilingualism as a factor; (5) hesitation phenomena and anxiety; and (6) hesitation phenomena and intelligence. Results of this study reveal that: (1) there is a significant difference in the frequencies of hesitations in impromptu and extemporaneous public speaking situations. Hesitations are more frequent in impromptu; (2) hesitations are higher in English impromptu and extemporaneous public speaking than in Filipino; (3) male speakers emitted more Filled Pauses than female speakers in extemporaneous public speaking in English; they had more Unfilled Pauses in extemporaneous and impromptu public speaking in English, and uttered more Repeats in extemporaneous public speaking in English. Female speakers uttered more Repeats in impromptu public speaking in English and committed more False Starts also in impromptu public speaking in English; (4) there is a significant relationship between hesitation phenomena and language; i.e., among bilingual speakers (English and Filipino), hesitation frequencies are higher in the English language; (5) there is a significant relationship between hesitation phenomena and anxiety, specifically the Unfilled Pause type of hesitation; and (6) there is no correlation between hesitation and intelligence.