A talk on vowel harmony in Ihanzu, given at the Ihanzu Symposium 2023. Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Nichols, Stephen. 2023. Investigating Vowel Harmony in Ihanzu. Talk given at the Ihanzu Symposium 2023, Bielefeld University, Germany. 29/09/2023.