Odo Morannal Reuter (28 April 1850 – 2 September 1913) was a Swedo-Finnish zoologist and poet.

[1][2] Reuter was a hemipterist, a specialist in mirid plant bugs, becoming the world's leading expert in this group at his time.

[3] He coined the term "parasitoid" to describe the way of life of species such as many wasps which feed on but do not immediately kill their prey.

His enthusiasm remained, and in 1911, despite his blindness, he published Nattens sånger (Night's Songs) describing the experiences of his latter years.

Reuter's many publications on entomology include: He also wrote literary criticism, travel guides and poetry.