Group III may refer to:

Chemistry

In the periodic table Group III formerly included these:

  • Group 13 elements: boron (B), aluminium (Al), gallium (Ga), indium (In), thallium (Tl).
  • Group 3 elements: scandium (Sc) and yttrium (Y) plus the lanthanide and actinide series elements.

Biology

  • The dsRNA viruses (e.g. Rotavirus) according to the Baltimore classification.
  • Group III introns, a class of introns found in mRNA genes of chloroplasts in euglenoid protists.

Other

  • Group III motor oil base stock as classified by the American Petroleum Institute