  The seesaw mechanism can be generalized to a Type-III variant and a
quintuplet variant. We present two models that provide analogous
generalizations of the inverse seesaw mechanism. The first model employs a
fermion triplet F ~ (1,3,0) and requires no additional multiplets or parameters
relative to the standard inverse seesaw. We argue that, from a bottom-up
perspective, there appears to be no particular reason to preference the usual
scenario over this variant. The second model employs a fermion quintuplet F ~
(1,5,0) and requires an additional scalar S ~ (1,4,1). We also show that
minimal inverse seesaws with even larger fermionic representations are not
expected to realize naturally small neutrino masses.
