Depending on the behavioral state, cortical networks express specific coherent activity patterns. In the hippocampus, memory acquisition goes along with gamma oscillations (30–80 Hz) whereas sharp-wave-ripple complexes (SPW-Rs) occur during resting immobility and slow wave sleep and mediate memory consolidation. Sharp waves initiate in CA3 and propagate via CA1 and the subiculum to the entorhinal cortex. They are superimposed by high-frequency (~200 Hz) oscillations and re-activate neuronal assemblies which were previously formed during gamma activity. While the dentate gyrus clearly participates in memory formation, it is unclear whether it plays a role in SPW-R activity. To answer this question we performed tetrode-recordings from selected hippocampal subfields in an in vitro model of SPW-Rs in mouse hippocampal slices. Specifically, we analyzed unit activity in the dentate gyrus (DG) and examined its temporal modulation by sharp waves and field ripples in CA3 and CA1. Unit activity in the DG displayed a clear increase during SPW events and, in some cases, even precise coupling to individual ripples cycles. This strong coherence persisted upon removal of the entorhinal cortex indicating that DG neurons are recruited via retrograde connections from CA3. We then investigated the stability of SPW-R-associated DG cell firing. Spontaneous SPW-R activity was interrupted by carbachol-induced gamma oscillations and re-installed by subsequent application of atropine. DG neurons showed increased firing during the second phase of SPW-R activity following gamma activity. The majority of identified units in the dentate gyrus maintained SPW-R coupled activity after the transient gamma period. This finding demonstrates the stability of SPW-R-entrained assemblies in the dentate gyrus. We conclude that the dentate gyrus actively participates in SPW-R oscillations and that individual neurons are specifically bound into the cellular network orchestrated during this type of hippocampal oscillation.