The Forward Detectors of CDF and DØ

The forward detectors of CDF II are presented with emphasis on design aspects that proved crucial for carrying out a successful program on diffraction at the Tevatron. Alignment, calibrations and backgrounds are discussed, pointing out their relevance to the diffractive and central exclusive production physics programs planned at the LHC. The DØ forward detectors, which with forward spectrometer on both the ¯p and p sides offer the opportunity for a program complementarity to that of CDF are briefly presented for completeness.