The present project examines the phonetic correlates, specifically those related to F0, of sarcastic speech. In a production study, American English speakers (N = 12) produced identically worded utterance pairs presented in contexts conducive to sarcasm and sincerity. Measures of F0 variability are contrasted; these are wiggliness and spaciousness [Wehrle, Cangemi, Krüger, & Grice (2018) Proceedings of AISV], F0 range and F0 mean SD. Raw values were entered into by-speaker logistic regression models. Wiggliness and spaciousness together were found to be comparable to F0 mean SD and F0 range in distinguishing sarcasm and sincerity for eight of the speakers. Intonational characteristics were further examined via by-speaker F0 contour clustering [Kaland, 2021]. These by-speaker analyses showed that many speakers produce contours characteristic of sarcasm or sincerity, but that these contours differ by speaker. Further exploration of a subset of nine speakers’ data showed that wiggliness and spaciousness alone can capture some of the differences between sincere and sarcastic contour clusters for some speakers. Speaker strategies vary in terms of F0, and sarcastic speech is characterized by reduced wiggliness and spaciousness for some of the speakers.