Sean O'Connor is an English-language voice actor known for his work on several anime series dubbed by Funimation. He is based in Auckland, New Zealand, where he works as an actor and voice artist.

O'Connor is best recognized for his role as Yuto Kiba in the long-running High School DxD franchise. He voiced this character across multiple seasons, including the original High School DxD series, High School DxD New, High School DxD BorN, and High School DxD Hero. In this franchise, he was part of a principal cast that included Josh Grelle as Issei Hyodo and Jamie Marchi as Rias Gremory. His performance as Yuto Kiba earned him a nomination for Best Male Lead Vocal Performance in an Anime Television Series/OVA at the 2015 Behind the Voice Actors Awards. He was also part of the ensemble for High School DxD that won the BTVA Award for Best Vocal Ensemble in 2015 and received a nomination in the same category in 2014. Additionally, he was nominated for Breakthrough Voice Actor of the Year at the 2014 BTVA Awards.

Another significant role in O'Connor's career is Kurama in the supernatural romance anime Kamisama Kiss. He voiced this character, a tengu crow and pop star, in both the first season and its sequel, Kamisama Kiss 2. In this production, he worked alongside voice actors such as Tia Ballard and J. Michael Tatum.

His body of work demonstrates a recurring collaboration with Funimation's talent pool in Dallas, Texas, frequently appearing in casts with actors like Jad Saxton and Josh Grelle across multiple projects. O'Connor's career in voice acting began after he started acting at the age of 41.