FZ, F-Z, Fz, or fz may refer to:
"FZZT" is the sixth episode of the first season of the American television series Agents of S.H.I.E.L.D., based on the Marvel Comics organization S.H.I.E.L.D.
Frizzled-6 is a protein that in humans is encoded by the FZD6 gene.
Frizzled-7 is a protein that in humans is encoded by the FZD7 gene.
Frizzled-3 is a protein that in humans is encoded by the FZD3 gene.
Fizzy-related protein homolog is a protein that in humans is encoded by the FZR1 gene.
Frizzled-8 is a protein that in humans is encoded by the FZD8 gene.