We show that quantum dot intersublevel transitions can be coupled to midinfrared photonic crystal modes. The coupling is observed under optical pumping with S-P intersublevel transitions of InGaAs self-assembled quantum dots resonant around 20 μm wavelength. An enhancement in the intersublevel absorption and a spectral tuning are evidenced when the optical modes of two-dimensional photonic crystals enter in resonance with the photoinduced intersublevel absorption. This effect is illustrated in the case of GaAs two-dimensional photonic crystal membranes with lattice periodicities of 10.5, 9.5, and 8.5 μm containing multilayers of self-assembled quantum dots.