Daniel Devost (CFHT) Title: Infrared Abundances of Nearby Galaxies from CFHT WIRCam and Spitzer. Abstract: I will present the CFHT WIRCam Large Program where we propose to conduct near infrared narrow and wide band imaging observations of the SIRTF Nearby Galaxy Survey (SINGS) sample of galaxies observed with the Infrared Spectrograph (IRS) onboard Spitzer. The main objective of the study is to derive H II region abundances and examine the properties of their global abundance gradients. Abundance studies in galaxies are numerous but remain essentially affected by incompleteness of the samples, abundance determination techniques, and spectroscopic and photometric systematic issues. Using near and mid-infrared atomic lines to derive these abundances, we plan to compare these findings with studies previously done in the optical using oxygen, sulfur, nitrogen and hydrogen narrow lines. We will then be able to better identify any global property present in galaxy abundances than those derived from optical lines since infrared lines are thought to be less sensitive to systematics like dust extinction or electronic temperature. I will mainly focus on optical determination of abundances and show what can be done in the infrared.