In this chapter we discuss the Goldstone mode in a fermionic superfluid. So far, we have discussed the Goldstone mode in a bosonic superfluid, Chap. 3, and the absence of a Goldstone mode in a fermionic superconductor, Chap. 6 In our field-theoretical discussion of a fermionic superfluid in Chap. 5 we have discussed fermionic excitations, in particular their energy gap.