The cerebral olfactory processing involves the limbic system at very first steps. Little is known about local field potentials elicited by odors in humans, especially the way the limbic system processes odor pleasantness. Here, we describe the single case of a patient (man, 39 years old) with pharmaco-resistant epilepsy monitored via stereotactically implanted depth electrodes (stereoelectroencephalography, SEEG) while passively receiving odors with different hedonic valences (peach or fish). SEEG was recorded from 96 contacts in the right hemisphere, located amongst others close to the piriform cortex, in the amygdala, hippocampus, and parahippocampal gyrus. Odors were delivered 20 times and for 3s each using a computer-controlled olfactometer in precise timing and constant airflow. Respiration was monitored to align the stimulus onset on the following inspiration. Using time-frequency analysis, oscillations of different frequency bands were described. From the closest contact to the piriform cortex in the amygdala, a specific olfactory pattern was observed for peach in the form of early theta/beta oscillations linked to the inspiration phase, followed by beta and gamma oscillations, as described in the literature. Only in the amygdala, and not in other brain areas, a similar pattern was observed. The fish odor induced the same activation pattern with, however, a delayed peak of activity. Unlike the pleasant peach odor, the unpleasant fish odor produced an early and sustained reinforcement of the delta band. For both odors, contrary to active sniff-induced olfactory processing seen in the literature, the gamma oscillations seemed to last less for passive smelling, with periodic repetition of the olfactory pattern. The parahippocampal gyrus showed differential oscillations between fish and peach. Taken together, these results provide first insights into differential oscillations patterns in the human primary olfactory cortex for pleasant and unpleasant odors.