• Forma † (uncertain)
• Formafentonia Matsumura, 1925 (uncertain)
• Formagnostus † (uncertain)
• Formaliocrinus Stukalina, 1980 † (uncertain)
• Formallia Viraktamath, 2011
• Formanekia Fleischer, 1923
• Formanhelena † (uncertain)
• Formania W.W. Smith & J.K. Small, 1922 [Family: Asteraceae]
• Formania Whalen & Carter, 1998 † (uncertain) [Family: Sarcomastigota (awaiting allocation)]
• Formanodendron K.C. Nixon & W.L. Crepet, 1989 accepted as Trigonobalanus Forman, 1962
• Formanodendron doichangensis (A. Camus) Nixon & Crepet accepted as Trigonobalanus doichangensis (A. Camus) Forman