Brian Peter John Molloy ONZM CRSNZ (12 August 1930 – 31 July 2022) was a New Zealand plant ecologist, conservationist, and rugby union player.

[2][3] The title of his master's thesis was A study in subalpine plant ecology on Fog Peak Ridge, Porters Pass, Canterbury.

[2] A halfback, Molloy made his debut for Manawatu at a provincial level while still a teenager, and later represented Canterbury when he was a university student in Christchurch.

[1][6] After his master's studies, Molloy worked for the Department of Agriculture as a research officer, investigating tussock grasslands, pasture ecology and weeds.

[6][12] Molloy was awarded the Loder Cup in 1990, in recognition of his contributions to conservation and the study of New Zealand native plants.

[7] In the 1997 Queen's Birthday Honours, Molloy was appointed an Officer of the New Zealand Order of Merit, for services to conservation.

[7] Two endemic plants have been named in Molloy's honour: the Cook Strait kōwhai, Sophora molloyi, in 2001; and the hidden spider orchid, Molloybas cryptanthus, in 2002.