| Hoffmann, Samantha L. | Cepheid variables and their application | 2013 | Texas A&M University | GMOS-N | USA |
| Hernández-Jiménez, José Andrés | Efeitos da Interação na Cinemática, Morfologia e Dinâmica das Galáxias em Fusão Menor AM1219 430, AM2058 381 e AM1228 260 | 2015 | Federal University of Rio Grande do Sul | GMOS-S | Brazil |
| Hermes, James Joseph, Jr. | Gravitational waves, pulsations, and more : high-speed photometry of low-mass, He-core white dwarfs | 2013 | The University of Texas at Austin | GMOS-N/GMOS-S | USA |
| Hennig, Moiré Gonçalves | Formação estelar e emissão de poeira em núcleos ativos de galáxias | 2018 | Universidade Federal de Santa Maria (UFSM) | NIFS+ALTAIR | Brazil |
| Helton, Lorren Andrew | Photometric and spectroscopic analysis of classical novae: an examination of their observational characteristics and greater astronomical impact | 2010 | University of Minnesota | GNIRS | USA |
| Harrison, Christopher Mark | Observational constraints on the influence of active galactic nuclei on the evolution of galaxies | 2014 | Durham University | GMOS-S/NIFS | UK |
| Hankins, Matthew | Exploring HII Regions and Massive Dusty Stars in the Galactic Center with SOFIA/FORCAST | 2018 | Cornell University | TRECS | USA |
| Hamer, Stephen | Cold gas in galaxy cluster cores | 2012 | Durham University | GMOS-N/GMOS-S | UK |
| Gusmão, Danilo Maciel Lopes | Estudo multi técnicas das regiões HII ultracompactas por espectroscopia de alta resolução espacial | 2015 | Universidade do Vale do Paraiba | | Brazil |
| Guha Niyogi, Suklima | Using infrared observations of circumstellar dust around evolved stars to test dust formation hypotheses | 2011 | University of Missouri - Columbia | MICHELLE | USA |
| Guarnieri, Pierandrea | Galaxy evolution at high redshift exploiting large galaxy surveys | 2019 | University of Portsmouth | GSAOI+GeMS | UK |
| Grier, Catherine J. | Active galactic nuclei: Masses and dynamics | 2013 | The Ohio State University | NIFS+ALTAIR | USA |
| Green, Andrew W. | Kinematics of star formation in evolving galaxies | 2012 | Swinburne University of Technology | NIFS+LGS | Australia |
| Granada, Anahi | Espectroscopia IR de estrellas B con lineas en emision | 2010 | Universidad Nacional de La Plata (UNLP) | NIRI/GNIRS | Argentina |
| Graham, Melissa Lynn | Nature versus nurture: how parent galaxy environments affect the rates and properties of their Type Ia supernovae | 2010 | University of Victoria | GMOS-S/GMOS-N | Canada |
| Graham, John F. | A study of Gamma-ray burst host galaxies | 2013 | The Johns Hopkins University | GMOS-N/GMOS-S | USA |
| Gonzalez, Marjorie Emily | X-ray observations of young neutron stars | 2007 | McGill University | NIRI | Canada |
| Gladstone, Jeanette | Optical & X-ray Studies of Ultraluminous X-ray Sources | 2010 | Durham University | GMOS-N/GMOS-S | UK |
| Gillman, Steven Richard
| Resolved Studies of the Dynamics, Star Formation and Chemical Properties of High-Redshift Galaxies | 2020 | Durham University | NIFS+ALTAIR | UK |
| Ghezzi, Luan | Metalicidades e Abundâncias de Lítio em Estrelas com Planetas como Vínculos para os Modelos de Formação Planetária | 2010 | Observatorio Nacional | bHROS | Brazil |
