| Barclay, Thomas | Searching for Variable Sources in the Rapid Temporal Survey | 2012 | University of London, University College London | GMOS-S | UK |
| Barbosa, Fausto | Cinemática estelar e de linhas de emissão na região nuclear de galáxias Seyfert com uso de espectrografia IFU | 2007 | Federal University of Rio Grande do Sul | GMOS-N | Brazil |
| Barbosa, Cassio | The environment of massive star birth sites | 2004 | University of Sao Paulo | TRECS | Brazil |
| Barber, Sara D. | Planetary remnants around white dwarf stars | 2015 | University of Oklahoma | NIRI | USA |
| Baravalle, Laura
| Objetos extensos en el relevamiento VISTA variables en la Via Lactea (VVV) | 2018 | Universidad Nacional de Cordoba | FLAMINGOS-2 | Argentina |
| Bannister, Michele | Bright trans-neptunian objects in the Southern sky | 2014 | Australian National University | GNIRS | Australia |
| Bandara, Kaushala | Applications of strong gravitaitonal lensing | 2014 | University of Victoria | NIFS+LGS | Canada |
| Ballering, Nicholas | Measuring the Structure and Composition of Circumstellar Debris Disks | 2016 | The University of Arizona | TRECS | USA |
| Bailey, Vanessa Perry | Adaptive optics for directly imaging planetary systems | 2015 | The University of Arizona | NICI | USA |
| Bahramian, Arash | Behavior of low-mass X-ray binaries and their formation in globular clusters | 2016 | University of Alberta | NIFS | Canada |
| Arriaga, Pauline Lim
| Multiband polarimetric imaging of debris disks with the Gmeini Planet Imager | 2020 | University of California, Los Angeles | GPI | USA |
| Andrews, Jennifer Erin | A Comprehensive Study of Dust Formation and Evolution in Core Collapse Supernovae | 2011 | Louisiana State University | GMOS-S | USA |
| Andrews, Jeffrey John | Double white dwarfs as probes of single and binary star evolution | 2016 | Columbia University | GMOS-N/GMOS-S | USA |
| Amodeo, Stefania
| Scaling relations and stellar populations of galaxy clusters from their first epochs of assembly to the present | 2018 | Université Paris/Observatoire de Paris | GMOS-N/GMOS-S | Other |
| Alves-Brito, Alan | Aglomerados Blobulares Ricos em Metais Traçadores da Evolução Química da Galáxia | 2008 | University of Sao Paulo | GMOS-N | Brazil |
| Alvares-Candal, Alvaro | Inter relação e Propriedades Físicas de Asteróides Cometas e Objetos Trans netunianos | 2006 | Observatorio Nacional | NIRI | Brazil |
| Alf Drehmer, Daniel | Cinemática Escalar, Modelos Dinâmicos e Determinação de Massas de Buracos Negros Supermassivos | 2015 | Federal University of Rio Grande do Sul | NIFS+ALTAIR | Brazil |
| Alexandersen, Mike | A carefully characterised Trans-Neptunians survey | 2015 | University of British Columbia | GMOS-N | Canada |
| Ainul-Annuar, Nur Adlyka Binti | Towards a Complete Census of the Compton-thick AGN Population in the Local Universe | 2017 | Durham University | TRECS | UK |
| Abbott, Jay Brian | Quantitative spectroscopic studies of Wolf-Rayet stars in local group galaxies | 2004 | University of London, University College London | GMOS-N | UK |
