The high scientific standards maintained by Journal of Water, Sanitation and Hygiene for Development in its papers owe much to the continuing dedication of the journal's reviewers, who give freely of their time and expertise. IWA is pleased to pay tribute to this contribution by recognizing those who have participated in the review process. Thus, the Editors of Journal of Water, Sanitation and Hygiene for Development acknowledge with particular gratitude the following reviewers who have reviewed papers during the period January 2020–December 2020.
| Tasneem Abbasi | Rachel Cardone | Shervin Hashemi | Annemarie Mink | John Safari |
| Shrawan Acharya | Maria Adriana Cardoso | Han Heijnen | Archisman Mohapatra | S Ramesh Sakthivel |
| Marieke Adank | Bruno Carvalho | Helvi Heinonen-Tanski | Isaac Monney | Lorena Salazar Gamez |
| Sunday Adesogan | Bruno Cedeño | Mitsuaki Hirai | Oscar Monroy | Drissa Sangare |
| Yvonne Adjakloe | K. Charles | Heike Hoffman | Patrick Moriarty | Ramazan Sayan |
| Agatha Aduro | Christie Chatterley | Omar Hopkins | Sibonakaliso Mpala | Vasco Schelbert |
| Alina Agafitei | Steven Chiesa | Bilqis Hoque | Arundati Muralidharan | Alyse Schrecongost |
| Benedicto Juan Enrique Aguilar | Claudious Chikozho | Marziyeh Horeh | Dennis Mwanza | Corinne Schuster-Wallace |
| Emmanuel Akpabio | Derek Chitwood | Guy Howard | Tanvi Nagpal | Rebecca Scott |
| Daniel Akrofi | Elizabeth Christenson | Guy Hutton | Ramakrishna Nallathiga | Lucas Seghezzo |
| Mahbub-Ul Alam | Chirhakarhula Chubaka | Ioannis Ieropoulos | Satya Narain | Jenna Senecal |
| Mohammad Rahanur Alam | Clement Cid | Tacettin Inandi | Abishek Narayan | Santiago Septien Stringel |
| Babu Alappat | Liah Coggins | Jawed Iqbal | Lata Narayanaswamy | Tjandra Setiadi |
| Muhammad Ali | Allison Daniel | S. Irianti | Colleen Naughton | Pablo Sezerino |
| Rashid Ali | Philip Darko | Mona Iyer | Jami Nelson-Nuñez | Fahad Shah |
| Katie Allen | AH de Moraes Neto | Vavaliya Jaladhi | Tula Ngasala | Katherine Shields |
| Paulo Almeida | Renu Desai | Amy Javernick-Will | Duc Canh Nguyen | Enkhtsetseg Shinee |
| Olufemi Aluko | Lauren D'Mello-Guyet | Rick Johnston | Viet Anh Nguyen | Ryan Sinclair |
| Custódio Alves | Leslie Dodson | Elizabeth Jordan | Anisha Nijhawan | Shirish Singh |
| Md. Nuhu Amin | Marta Domini | K. Mophin Kani | Charles Niwagaba | SK Singh |
| Josephine Antonio | Alfred Dongzagla | Deepa Karthykeyan | Karoli Njau | Charlotte Smith |
| Eugene Appiah-Effah | Caetano Dorea | Emma Kelly | Chidozie Nnaji | Thomas Soerens |
| Colleen Archer | Robert Dreibelbis | Patiya Kemacheevakul | Punita Nook Naidu | Seyram Kossi Sossou |
| Frederick Armah | Ni Made Utami Dwipayanti | Syed Najam Khurshid | Sydney Nsubuga | Dorothee Spuhler |
| Alex Armand | Olugbenga Elemile | Richard Kimwaga | Clair Null | Christine Stauber |
| Sudipti Arora | Elsayed Elkhatib | Halidou Koanda | Ify Nwaogazie | William Strosnider |
| Nicholas Ashbolt | Barbara Evans | Niranjan Koirala | Daniel Nzengya | Krishna Mohan Surapaneni |
| Manish Baidya | Shakhawat Faisal | Pete Kolsky | Stewart Oakley | Nawatch Surinkul |
| Babul Bala | Roger Falconer | Nazli Koseoglu | Kwame Obeng Nti | David Sutherland |
| Radu Ban | Peter Feldman | Enoch Kosoe | Elizabeth Ochola | Adugnaw Tadesse |
| Dani Barrington | Catarina Fonseca | Monica Kothari | Adebayo Ogundipe | Kevin Tayler |
| Rafael Bastos | Gary Foutch | Richard Kuffour | James Okot-Okumu | James Tidwell |
| Cara Beal | Colin Fricker | Robinah Kulabako | Kenan Okurut | Elizabeth Tilley |
| Nicole Behnke | Sean Furey | Tyhra Kumasi | Aaron Opdyke | Sithabile Tirivarombo |
| David Bethune | Joseph Gadek | Save Kumwenda | Jennifer Orgill-Meyer | Gary Toranzos |
| Mohammad Bhat | Crisanto Galay Jr | Arti Kundu | Jonathan Parkinson | Andrés Felipe Torres Franco |
| Sami Bhat | Jo-Anne Geere | Julio Issao Kuwajima | Jessica Patrick | Demetrios Tsesmelis |
| Ajay Bhave | Rick Gelting | Krishna Lamichhane | José Raúll Pérez Durín | Sayed Mohammad Nazim Uddin |
| Dhruv Bhavsar | Jessen George | Rebecca Lane Evans | Andrea Perez-Vidal | Lukas Ulrich |
| Aminul Haque Bhuyan | Nicolas Gerber | Daniele Lantagne | Verena Pfeiffer | Mohammad Valipour |
| Gulilat Birhane Eshetu | Abraham Geremew | Wilfried Letah Nzouebet | Megha Phansalkar | Carolien van der Voorden |
| Obadia Bishoge | Gopal Ghosh | Remi Lombard-Latune | Johann Poinapen | Barbara Van Koppen |
| Elijah Bisung | Walter Gibson | Melanie Luehrman | Caroline Pompei | Ismael Vera |
| Aaron Bivins | Francesco Gimelli | Jess MacArthur | Tatchai Pussayanavin | Bala Vigneswaran |
| Isabel Blackett | Aderajew Girmay | Maritza Macias-Corral | Montserrat Rabago Smith | Xin Wang |
| Claudio Blanco | Heather Goetsch | Carlos Arturo Madera Parra | Mark Radin | Kavita Wankhade |
| Eline Boelee | Sonia Grego | Daniel Maeusezahl | S Raghavulu | James Winter |
| Susan Bolton | Aashish Gupta | Priscilla Magrath | Suraja Raj | Michael Witty |
| Matthew Bond | Sunil Gupta | Michuki Maina | Dilip B. Rana | Jim Wright |
| Robert Bos | David Gute | Nehreen Majed | Bakul Rao | Tesfayohanes Yacob |
| Clarissa Brocklehurst | Miriam Hacker | Arunabha Majumder | Sujaya Rathi | Teshome Yami |
| Christopher Brouckaert | Getachew Hailemichael | Heinz-Peter Mang | Cheerawit Rattanapan | Mehmet Irfan Yesilnacar |
| Joe Brown | Ralph Hall | Sara Marks | James M Raude | Kyana Young |
| Steven Buchberger | Leigh Hamlet | Stephanie Maurissen | Ratna Reddy | Helena Zer |
| John Butterworth | Adrian Hanson | Megat Hanafiah Megat Ahmad Kamal | Brian Reed | Guangcan Zhu |
| Sydney Byrns | Hidenori Harada | Regula Meierhofer | Jan-Willem Rosenboom | Valentina Zuin |
| Nagendranatha Reddy C | James Harper | Leopoldo Mendoza-Espinosa | Ian Ross | |
| Drew Capone | Peter Harvey | Hunachew Mengesha | Xanthe Roux |