| Cheetham, Anthony Craig | High resolution imaging and the formation of stars and planets | 2015 | University of Syndey | GPI | Australia |
| Cerulo, Pierluigi | The build-up of the red sequence in high redshift galaxy clusters | 2015 | Swinburne University of Technology | GMOS-N | Australia |
| Castanheira, Barbara Garcia | Sismologia das estrelas ZZ Ceti | 2007 | Federal University of Rio Grande do Sul | GMOS-N | Brazil |
| Caso, Juan Pablo | Estudio de enanas ultra-compactas y cumulos globulares en el cumulo de Antlia | 2015 | Universidad Nacional de La Plata (UNLP) | GMOS-S | Argentina |
| Caruana, Joseph | Spectroscopic analysis of primeval galaxy candidates | 2013 | University of Oxford | GNIRS | UK |
| Carpes, Hekatelyne Prestes | Cinemática e excitação do gás em galáxias com emissão megamaser de OH | 2018 | Universidade Federal de Santa Maria (UFSM) | GMOS-N/GMOS-S | Brazil |
| Carlos, Marilia G. | Chemical abundances of G and K dwarfs and stellar evolution models for [Fe/H]=-1.8 and [Fe/H]=-1.0 with alpha-enhancement | 2020 | University of San Paulo | GRACES | Brazil |
| Caris, Evelyn Elizabeth | Size and velocity dispersion evolution of red and dead galaxies | 2013 | Swinburne University of Technology | GMOS-N | Australia |
| Cao, Yi | Cosmic explosions: observations of infant hydrogen-free supernovae towards an understanding of their parent systems | 2016 | California Institute of Technology | GMOS-N | USA |
| Cano, Zach | The nature of gamma ray burst supernovae | 2011 | Liverpool John Moores University | GMOS-N/GMOS-S | UK |
| Camperi, Javier | Estudio espectrofotométrico de la galaxia NGC 253 | 2018 | Universidad Nacional de Córdoba | TRECS/FLAMINGOS-2 | Argentina |
| Caminha, Gabriel Bartosch | Um Prelúdio Para o Levantamento Gravitacional Forte em Levantamentos de Grandes Áreas | 2013 | Centro Brasileiro de Pesquisas Fisicas | | Brazil |
| Calderon, Juan Pablo | Estudio de propiedades fotometricas de galaxias en el cumulo de Antlia | 2015 | Universidad Nacional de La Plata (UNLP) | GMOS-S | Argentina |
| Caballero-nieves, Saida | A tale of two telescopes: Taking a closer look at the multiplicity properties of massive stars in Cygnus | 2012 | Georgia State University | NIRI+ALTAIR | USA |
| Bussmann, Robert Shane | The nature of dust-obscured galaxies at z~2 | 2010 | University of Arizona | NIRI | USA |
| Bursick, Shelly K. | Two multicolor surveys for quasars at redshifts greater than 4.5 | 2009 | University of Arkansas | GMOS-S | USA |
| Bruzzone, Juan Sebastian | Mapping Debris Disks at extreme contrast: near-IR Polarimetric Differential Imaging with the Gemini Planet Imager | 2018 | University of Western Ontario | GPI | Canada |
| Bowler, Brendan Peter | Direct imaging search for planets around low-mass stars and spectroscopic characterization of young exoplanets | 2013 | University of Hawaii | NIFS+ALTAIR | USA |
| Bott, Kimberly M. | Polarimetry of hot-Jupiter systems and radiative transfer models of planetary atmospheres | 2017 | University of New South Wales | GNIRS | Australia |
| Bosman, Sarah Elena Ivana | Quasars at the high redshift frontier | 2017 | University of Cambridge | GMOS-S | UK |
