| Author (and author names) | Published between | No. of references | No. of described taxa (valid) |
|---|---|---|---|
| Nutting, W. L. | 1950–1965 | 2 | – |
| Nygaard, S. | 2011–2012 | 2 | – |
| Nylander, W. | 1846–1857 | 7 | 33 |
| O'Connell, L. A. | 2016 | 1 | 1 |
| O'Connor, J. P. | 2000 | 1 | – |
| O'Donnell, S. | 2005–2007 | 2 | – |
| O'Hara, B. C. | 2002 | 1 | – |
| O'Keefe, S. T. | 1998–2000 | 2 | 1 |
| O'Neill, K. M. | 1997 | 1 | – |
| O'Reilly | – | – | – |
| O'Reilly, A. J. | 2013 | 1 | 3 |
| O'Rourke, F. J. | 1940–1979 | 7 | – |
| Oakey, J. | 2011 | 1 | – |
| Obermayer, M. | 1992–1996 | 4 | – |
| Oberski, J. | 2022 | 1 | – |
| Oberski, J. T. | 2021–2024 | 2 | – |
| Oberstadt, B. | 1999–2003 | 3 | – |
| Obin, M. S. | 1989 | 1 | – |
| Ochi, K. | 1983 | 1 | – |
| Ockermüller, E. | 2023 | 1 | 1 |
| Oeser, R. | 1961 | 1 | – |
| Oettler, J. | 2010–2016 | 4 | – |
| Ofer, J. | 1970–1988 | 3 | – |
| Ofer, Y. | 1996–2010 | 2 | – |
| Ogata, K. | 1982–2021 | 63 | 79 |
| Ogloblin, D. A. | 1933 | 1 | – |
| Ogura, K. | 1994 | 1 | – |
| Oguri, E. | 2014–2024 | 4 | 1 |
| Ohkawara, K. | 2001–2012 | 4 | – |
| Ohl, M. | 2004 | 1 | – |
| Ohnishi, H. | 1998–2004 | 2 | – |
| Ohsumi, N. | 1997 | 1 | – |
| Ohta, Y. | 1931–1940 | 8 | – |
| Ojdowska, E. | 2011 | 1 | – |
| Okamoto, H. | 1952–1972 | 8 | – |
| Okamoto, M. | 2012 | 1 | – |
| Okano, K. | 1945–1989 | 6 | – |
| Okido, H. | 2002–2020 | 6 | 41 |
| Okita, I. | 2013–2017 | 2 | 1 |
| Okot-Kotber, B. M. | 1985 | 1 | – |
| Okutani, T. | 1977 | 1 | – |
| Oldham, N. J. | 1994–2002 | 5 | – |
| Oldroyd, B.; Oldroyd, B. P. | 1998–2008 | 3 | – |
| Oliveira Freitas, A. de | 1960 | 1 | – |
| Oliveira, A. C. | 2007 | 1 | – |
| Oliveira, A. M. | 2019–2021 | 2 | 9 |
| Oliveira, A. R. | 2012 | 1 | – |
| Oliveira, M. A. | 2019 | 1 | – |
| Oliveira, M. A. de | 1993–1996 | 2 | – |
| Oliveira, M. L. | 2015–2021 | 5 | 1 |
| Oliveira, M. L. de | 2012–2014 | 2 | 2 |
| Oliveira, P. S. | 1991–1996 | 3 | – |
| Oliveira, R. M. | 1997 | 1 | – |
| Olivella, I. | 1984 | 1 | – |
| Oliver, I. | 1993–1996 | 3 | – |
| Oliveria, M. A. | – | – | – |
| Olivero, D. Y. | 2007 | 1 | – |
| Olivier, A. G. | 1792 | 1 | 8 |
| Ollett, D. G. | 1986–1987 | 2 | – |
| Olmos, D. | 2003 | 1 | – |