Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Algorithms was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 15 days and the median time to publication was 35 days. The editors would like to extend their gratitude and recognition to the following re-viewers for their precious time and dedication, regardless of whether the papers they re-viewed were finally published:
| Abdelkader Ouali | Kyung-Yong Chung |
| Abu Asaduzzaman | Lars Rohwedder |
| Adam Kolkiewicz | László Juhász |
| Adriana Burlea-Schiopoiu | Laura Pierucci |
| Ágnes Vathy-Fogarassy | Laurens Muter |
| Ahmed Mostafa | Laurent Dewasme |
| Albina Orlando | Laurent Donzé |
| Aleksandar Erceg | Lenwood S. Heath |
| Aleksander Król | Leonardo Rundo |
| Aleksandr Rakhmangulov | Linas Petkevičius |
| Alessandro Fedeli | Lino De Oliveira Santos |
| Alessio Martino | Liqing Zhang |
| Alexander Schaum | Lorenzo Salas-Morera |
| Alexandros Tzanetos | Luc Jaulin |
| Alexandru Banica | Luigi Aldieri |
| Alfonsas Misevicius | Luís Cavique |
| Ali Wagdy Mohamed | Luis N. López De Lacalle |
| Alok Mishra | Luiz S. Martins-Filho |
| Alwin Poulose | Łukasz Knypiński |
| Amir Mosavi | Magdalena Wyrwicka |
| Andras Farago | Mahdi Rezapour |
| André Bigand | Mahmoud Elbattah |
| Andrea Colagrossi | Mahmoud El-Morshedy |
| Andrea Serani | Manuel Lafond |
| Andrea Tangherloni | Manuel Martinez |
| Andreas Beham | Marc Juarez |
| Andreas Bück | Marcelo De Carvalho Alves |
| Andreas Kanavos | Marcelo Kaminski Lenzi |
| Andreas Keler | Marco Antonio Amaral |
| Andreas Schreiber | Marco Gavanelli |
| Andrej Sarjas | Marco Jose |
| Andries Engelbrecht | Marcus Gallagher |
| Andrzej Gnatowski | Marde Helbig |
| Andrzej Kasperski | Maria Evelina Mognaschi |
| Andrzej Pacana | María Isabel Parra Arévalo |
| Anna Borucka | María J. Fuente |
| Annunziata Esposito Amideo | Marian Wysocki |
| Anthony G. Constantinides | Mário Basto |
| Anthony Rossiter | Mario Brcic |
| Antonella Falini | Mario Marinelli |
| Antonello Rosato | Mário Véstias |
| Antonio De Leon Rodriguez | Mariusz Topolski |
| Antonio Jiménez-Martín | Mariusz Uchroński |
| António Miguel Rosado Da Cruz | Mark Kelbert |
| Arlindo Silva | Marko Horvat |
| Arnadi Murtiyoso | Markus Rabe |
| Arne Johannssen | Martin Kenyeres |
| Arseny Shur | Masaki Ogura |
| Artem Metlin | Mateus Mendes |
| Artur Jeż | Matija Perne |
| Ashok Kumar Patil | Mauricio A. Sanchez |
| Atanaska Georgieva | Mau-Tsuen Yang |
| Atefeh Hajijamali Arani | Max Bannach |
| Athanasios Tsadiras | Mehdi Ghayoumi |
| Audrius Banaitis | Mehdi Neshat |
| Aurélien Arnaubec | Mehdi Salimi |
| Baoye Song | Meirav Zehavi |
| Bariscan Yonel | Miao Ling Wang |
| Bartosz Sawik | Michal Jasinski |
| Basarab Matei | Michal Kvet |
| Begoña Guirao | Michele Coscia |
| Bhogendra Mishra | Michele Leonardo Bianchi |
| Binhai Zhu | Miha Ravber |
| Birgitta Dresp-Langley | Mihaela Hnatiu |
| Boris Aberšek | Mikhail Oet |
| Bruce Ndibanje | Mikhail Tarkov |
| Byung-Hoon Kim | Miklós Krész |
| Cagatay Iris | Mikołaj Karpiński |
| Calogero Vetro | Minas Dasygenis |
| Carlo Meloni | Mingchang Chih |
| Carmelo Majorana | Ming-Xing Luo |
| Chaman Verma | Miriam Leeser |
| Chih-Peng Fan | Mitica Craus |
| Christian Bongiorno | M.L. Puertas |
| Christoph Waibel | Mohamed A. A. Ismail |
| Christophe Chesneau | Mohammad Ali Nilforooshan |
| Christopher John Price | Mohammad Ashrafuzzaman |
| Christopher Martin Van Bommel | Mohammad Bagher Dowlatshahi |
| Christopher W. Cleghorn | Mohammad Jafari |
| Christopher Zimmer | Mohd Nor Akmal Khalid |
| Christos Makris | Mohiuddin Ahmed |
| Christos S. Antonopoulos | Mohsen Rezvani |
| Chrysafis Vogiatzis | Monge Marco Antonio Sotelo |
| Chung-Ping Chang | Monica Berrondo |
| Claudia Marzi | Mostafa Mjahed |
| Costas Vassilakis | Muhammad Fahad Zia |
| Cristian Lucian Stanciu | Muhammad Shafiq |
| Cristian Mihaescu | Muhammad Syafrudin |
| Cristian P. Lungu | Mustafa Sarimollaoglu |
| Cristina Martín Doñate | Muzaffar Rao |
| Cristina Requejo | Nadia El-Mabrouk |
| Dallan Byrne | Nagham Saeed |
| Daming Zhu | Naomitsu Urasaki |
| Dana-Mihaela Petroșanu | Naveed Ahmed Azam |
| Danica Rosinová | Nguyen Quoc Khanh Le |
| Daniel Rohacs | Nhat Ho |
| Daniela Briola | Nick Bassiliades |
| Daniele Frigioni | Nick Pitropakis |
| Daniel-Ioan Curiac | Nikola Gradojevic |
| Danilo Medeiros Eler | Nikola Poljak |
| Daniyal Haider | Nikolai Krivulin |
| Darío Garigliotti | Nodari Vakhania |
| Dariusz Horla | Oliviero Carugo |
| Darren A. Narayan | Omar Darwish |
| Davi Viana | Otoniel Mario López Granado |
| David Allouche | Ovidiu Cosma |
| David Lai | Panagiotis D. Michailidis |
| David Luengo | Paolo Mercorelli |
| David Sankoff | Patricia Evans |
| Davide Bilò | Patricia Takako Endo |
| Davide Fioriti | Patricio Domingues |
| Dawid Polap | Patrick McClure |
| Denis Delisle Rodriguez | Paul Farago |
| Diego Romano | Paulo Ferreira |
| Dilip K. Prasad | Paweł Jabłoński |
| Dimosthenis Kifokeris | Paweł Weichbroth |
| Diogo Poças | Pedro Gómez |
| Dmitry Bankov | Per Håkan Lundow |
| Dmitry Kosolobov | Peter Von Zur Muehlen |
| Dmitry Kruchinin | Philip Bille |
| Dmitry Lukyanenko | Piergiuseppe Di Marco |
| Dmitry Ruban | Pierre Borgnat |
| Dong Min Kim | Piotr Gierlak |
| Dusan Knop | Piotr Miller |
| Edorta Carrascal Lekunberri | Plácido Moreno Beltrán |
| Ehsan Bhuiyan | Pratip Rana |
| Eirini Eleni Tsiropoulou | Qiangfu Zhao |
| Elena M. Hernández Pereira | Rachid Saadane |
| Elena Nechita | Radoslaw Michalski |
| Elsa Cazelles | Rafał Dreżewski |
| Elzbieta Sidorowicz | Ragnar Freij-Hollanti |
| Emanuel Weitschek | Rahul Singh |
| Enrique Casarejos | Raimo Kantola |
| Erfan Maleki | Ramiro Rico-Martinez |
| Eric Tannier | Ramyaa Ramyaa |
| Erik Cambria | Rashid Mehmood |
| Ewa Roszkowska | Rastislav Róka |
| Fabio D'Andreagiovanni | Razvan Bocu |
| Fabrizio Balducci | Rekha Guchhait |
| Faranak Rabiei | Renato Portugal |
| Farzin Piltan | Ricardo De Matos Simoes |
| Federico Pittino | Rita Girão Silva |
| Felipe Martins Muller | Rittika Shamsuddin |
| Felix Albu | Robertas Damaševičius |
| Ferda Halicioglu | Rodney Graham Downey |
| Fernando Luis-Ferreira | Rodrigo Righi |
| Filippo Biondi | Rodriguez Miguel Pineda |
| Flavia Bonomo | Romero Fernando Castaño |
| Francesca Abastante | Rossitza Goleva |
| Francisco Cuevas De La Rosa | Rui Zhang |
| Franco Alberto Cardillo | Saleh Mobayen |
| Franya Franek | Salman Ahmadi-Asl |
| Freddy Gabbay | Salvatore Corrente |
| Furqan Aziz | Salvatore Flavio Pileggi |
| Fuyi Li | Salvina Gagliano |
| Fu-yuen Hsiao | Sam Amiri |
| Gaetano Salina | Samad Noeiaghdam |
| Gang Kou | Sandy Brownlee |
| Geneviève Simonet | Sašo Karakatič |
| Geoffrey Grime | Sathishkumar Murugesan |
| George K. Adam | Satoshi Uchida |
| George Matsopoulos | Scott D. Flamm |
| Georgios Alexandridis | Sejong Oh |
| Georgios Kostopoulos | Seong-Ik Han |
| Georgios Tsekouras | Serafino Cicerone |
| Gianni D'Angelo | Serdar Durdyev |
| Gilles Didier | Sergei Sidorov |
| Giordano Danilo | Sergey Lashin |
| Giorgio Audrito | Sergii Babichev |
| Giorgio Gosti | Sevvandi Kandanaarachchi |
| Giulia Caruso | Seyed Mohammad Ghoreyshi |
| Giuliano Zambonin | Seyedali Mirjalili |
| Giuseppina Inuso | Shady H.E. Abdel Aleem |
| Gokarna Sharma | Shashi Raj Pandey |
| Grzegorz Dombek | Sheraz Aslam |
| Guillermo Hauke | Sherief Hashima |
| Guillermo Valencia-Palomo | Sherzod Turaev |
| Guohao Dai | Shinichi Yamagiwa |
| Gupta Rajan | Shmuel Tomi Klein |
| Gustavo Pinto | Shu-Chuan Chu |
| Guy Mélard | Shunsuke Shiraishi |
| Gyanendra Prasad Joshi | Simona Moldovanu |
| György Dósa | Sin-Jin Lin |
| Han Zhang | Slawomir Jarek |
| Hanna Furmańczyk | Socrates Basbas |
| Hanno Hildmann | Sotirios Kontogiannis |
| Hao Wang | Spyros Kontogiannis |
| Haoran Chi | Stanislav Harizanov |
| Heike Trautmann | Stefania Tronci |
| Helbert Eduardo Espitia | Stefano Antonio Gattone |
| Helmut Ahammer | Stefano Guerrini |
| Hendrik Richter | Stefano Seriani |
| Hoai Nam Huynh | Stefka Fidanova |
| Hoang Nguyen | Sung Jin Yoo |
| Hongtian Chen | Sung Wook Paek |
| Ieva Meidute-Kavaliauskiene | Sungho Suh |
| Igor Vujović | Sung-Hoon Mok |
| Ilia Safonov | Sungyong Choi |
| Ilie Valentin Mihai | Surender Reddy Salkuti |
| Ilja Kröker | Suxing Liu |
| Indika Kumara | Sven Bingert |
| Ioannis Tsoulos | Svetlozar T. Rachev |
| Ionel Zagan | Syed Tahir Hussain Rizvi |
| Ionut Brandusoiu | Sylvio Barbon Junior |
| Iouliia Skliarova | Szabolcs Duleba |
| Iulian Grindeanu | Tae-Eung Sung |
| Ivan Izonin | Taeho Kim |
| Ivan Marović | Tage Mohammadat |
| Ivan Virgala | Takuya Kida |
| Ivana Kolingerova | Talha Bin Masood |
| Iwona Włoch | Tamer Abdelmaguid |
| Jaehyuk Choi | Thaha Mohammed |
| Jakub Nalepa | Theodore Andronikos |
| Jan Goedgebeur | Thierry Lecroq |
| Jan Van Casteren | Thomas Espitau |
| Jared Adolf-Bryfogle | Thomas Kletschkowski |
| Jaroslav Mlynek | Thomas P. Karnowski |
| Jarosław Figwer | Tihomir Opetuk |
| Jarosław Rybak | Tom Huxford |
| Jaroslaw Watrobski | Tomas Balezentis |
| Javier E. Contreras-Reyes | Tomasz Górski |
| Javier Oliver-Muncharaz | Tome Eftimov |
| Jean-Luc Prigent | Travis Gagie |
| Je-Keun Rhee | Vadim S. Tynchenko |
| Jens Heger | Vaggelis Kapoulas |
| Jerzy Rosłon | Valdivieso Pedro A. Castillo |
| Jianing Li | Valentin Năvrăpescu |
| Jianshe Ma | Valentino Santucci |
| Jie Hua | Vanissorn Vimonsatit |
| Jiří Škvor | Vasile Daniel Pavaloaia |
| Joana Alegria Quintela | Vasilis Dimitriou |
| João Pedro Barreto | Vasiliy Elagin |
| John Pryce | Venanzio Giannella |
| John R. Woodward | Víctor Manuel Rivas Santos |
| John Samuel | Vikram Mulligan |
| Jörg Rothe | Violeta Kersuliene |
| José Antonio Castellanos Garzón | Viorel Minzu |
| José Antonio De Diego Onsurbe | Vittoria Cozza |
| José Ramón Cardona | Vittorio Bilò |
| José Ramón Gaxiola-Camacho | Vlad Diaconita |
| José Santos | Vladimir Stanovov |
| Jozsef Katona | Vladimir V. Semenov |
| Juan Miguel Benito-Ostolaza | Wojciech Sałabun |
| Jude Hemanth | Wolfgang Schreiner |
| Julien Alexandre dit Sandretto | Wookyong Kwon |
| Junayed Pasha | Xi Jin |
| Juri Hinz | Xiaoshuang Shi |
| Juvenal Rodríguez-Reséndiz | Xuefeng Zhang |
| Karel Charvat | Xunyuan Yin |
| Karl Jones | Yanfei Lu |
| Karol Winkelmann | Yeou-Jiunn Chen |
| Karthikeyan Subramanian | Yessica Nataliani |
| Katarzyna Antosz | Young-Seob Jeong |
| Katarzyna Kaczmarek-Majer | Yu Lin |
| Kaustav Kundu | Yu Tang |
| Kazuyuki Takai | Yuan Sun |
| Kei Nakagawa | Yuantao Gu |
| Kenji Ikehara | Yu-Chi Chung |
| Kenneth Moreland | Yuhu Wu |
| Keshav Singh | Yuji Iwahori |
| Khushboo Munir | Yung-Hui Li |
| Kirill Kuzmin | Yuri Pirola |
| Komori Osamu | Zbigniew Zakrzewski |
| Konstantinos Giannoutakis | Zelun Wang |
| Konstantinos Syriopoulos | Zeno Toffano |
| Krzysztof Chwastek | Zenon A. Sosnowski |
| Krzysztof Klimaszewski | Zhen Zhang |
| Kyi Thar | Zlatin Zlatev |
| Kyungjoo Kim |
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