Jennifer "Jenni" Anne MacKinnon Sidey-Gibbons (born 3 August 1988) is a Canadian astronaut, engineer, and academic.

In 2023, CSA assigned her to be Jeremy Hansen's backup for the Artemis II lunar flyby mission.

Her doctoral research, supervised by Professor Nondas Mastorakos, focused on combustion processes.

Her research centered on turbulent flame dynamics and pollutant reduction in combustion systems.

On 22 November 2023, during a public ceremony at CSA headquarters, Gibbons was announced as the backup for Jeremy Hansen on the Artemis II mission.