Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Actuators 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 17 days and the median time to publication was 41 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abdelkrem Eltaggaz | Jiang Guo |
| Abdon Pena-Francesch | Jie Deng |
| Adnan Ghaffar | Jihyuk Park |
| Adrian Filipescu | Jin Gong |
| Adrian Gligor | Jin Ning |
| Afaque Manzoor | Jinbo Wu |
| Agustín L. Herrera-May | Jinglun Feng |
| Akio Namiki | Jinkui Chu |
| Alaa Al-Ibadi | Jinlian Hu |
| Alain Vande Wouwer | Jinzhi Wu |
| Alan Kubrusly | Joanna Korzekwa |
| Alan M. Wemyss | Joanna Zietkiewicz |
| Alessandra Vitanza | João Falcão Carneiro |
| Alessandro Ridolfi | João Fradinho Oliveira |
| Alexander Hošovský | Jong-Chan Kim |
| Alexander Smirnov | Jongho Lee |
| Alexandru Martian | Jong-Suk Ro |
| Alexandru Onea | Jongwon Choi |
| Ali Zolfagharian | Jorge Ferreira |
| Almeida Anibal De | Jorge Feuchtwanger |
| Álvaro Gutiérrez | Jorge Luis Parrondo-Gayo |
| Amelie Hagelauer | Jose De Jesus Rubio |
| Amir Haider Malik | José Gonçalves |
| Amir M. Anvar | Jose González |
| Amir Mohajeri | Jose Luis Sanchez-Rojas |
| Amr Adly | José Rafael García-Sánchez |
| Anand Kumar Mishra | Josip Brnić |
| Anargyros Karakalas | Józef Drewniak |
| Anatoly N. Ladygin | Jozef Svetlík |
| Anca Maxim | Jozsef Sarosi |
| Andrea I. Deaconescu | Juan P. Amezquita-Sanchez |
| Andrei Andras | Jun Huang |
| Andrei Olaru | Jung Woo Sohn |
| Andrew Gryguć | Jürgen Weber |
| Andryushin Konstantin Petrovich | Juvenal Rodríguez-Reséndiz |
| Andrzej Koszewnik | K. Ellermann |
| Angelo Accetta | K. P. Jayachandran |
| Anh-Tu Nguyen | Kai Litzius |
| Anna Borucka | Kai Zhou |
| Antonio Concilio | Kamran Iqbal |
| Antonio Giallanza | Karel Hruska |
| Antonio Jesús Yuste Delgado | Karla Merazzo |
| Antonio Pérez-González | Karol Kyslan |
| Arash M. Dizqah | Katarzyna Hojan |
| Arkadiusz Mystkowski | Katsushi Furutani |
| Arnaldo Leal-Junior | Kazem Ghabraie |
| Arvydas Palevicius | Ke Shao |
| Asanthi Jinasena | Keishi Naito |
| Ashiqur Rahaman | Ken Sasaki |
| Asif Khan | Keun-Young Yoon |
| Athanasios Chasalevris | Ki-Chan Kim |
| Aurelio Melo | Kodnyanko Vladimir |
| Aykut Tamer | Koichi Koganezawa |
| Azar Maalouf | Kosmanis Theodoros |
| Azeddine Houari | Kristin Payrebrune |
| Barbara Zardin | Krzysztof Okarma |
| Basaran Bahadir Kocer | Krzysztof Rogowski |
| Basuraj Bhowmik | Kumar Prashant |
| Ben Bin Xu | Kun Jia |
| Benjamin Evans | Kyung-Hoon Cho |
| Benjie Tang | Laszlo Barna Iantovics |
| Bernhard Penzlin | Lauren Garten |
| Boyuan Li | Laurent Gallimard |
| Bruno Brunone | Laurentiu Milici |
| Bülent Delibas | LaVern Starman |
| Calin Ciufudean | Leire Godino |
| Calin Rusu | Leonardo Acho Zuppa |
| Capace Alessia | Leonardo Riccardi |
| Carl Strathearn | Leszek Ambroziak |
| Carlo Ferraresi | Leung Franco King-Chi |
| Carlos A. Cifuentes | Levon Gevorkov |
| Carlos Roberto Minussi | Lianjun Wu |
| Carlos Rubio-Sierra | Lin Zhang |
| Carlos Sánchez-López | Liselott Ericson |
| Carlos-Alberto Cruz-Villar | Litong Lyu |
| Catalin Alexandru | Liu Wang |
| Catalin Arghir | Liu Yang |
| Catalin Dumitrescu | Liudmila Makarova |
| Cepreй Ильич Konovalov | Logan T. Trujillo |
| Chang-Sei Kim | Lorena Pardo |
| Chan-Jung Kim | Luca Fredianelli |
| Chao-Chung Peng | Luca Pugi |
| Chengli Song | Lucian Pislaru-Danescu |
| Chengqing Liu | Lucjan Kozielski |
| Chengyi Xu | Luigi Fortuna |
| Chi Hou Lei | Luigi Iannelli |
| Chien-Sheng Liu | Luigi Manfredi |
| Chikit Au | Luis Carlos Sandoval-Herazo |
| Chiu-Keng Lai | Luis Ignacio Lopera González |
| Chongjing Cao | Luiz Gonçalves |
| Choon-man Lee | Łukasz Knypiński |
| Christian Zehetner | Łukasz Sienkiewicz |
| Christian-Alexander Bunge | Luke Beardslee |
| Christophe Aubrun | Lyuba Alboul |
| Christopher Baer | Mădălina Dumitriu |
| Chuanqi Tan | Magd Abdel Wahab |
| Chun Sing Lai | Makiko Kobayashi |
| Chun-Liang Lin | Manuel Beschi |
| Chun-Liang Yeh | Manuel Braz César |
| Chunsheng Wen | Manuel Moreno |
| Chuong Ngo | Manuel Pineda-Sanchez |
| Ciprian Lapusan | Manuel R. Arahal |
| Ciprian Lupu | Marc Desmulliez |
| Claudio Rossi | Marco Righi |
| Constantin Volosencu | Marco Silvestri |
| Constantine Kotropoulos | Marcus Varanis |
| Cosimo Gentile | Marek Stulrajter |
| Costantino Balestra | Margarita Ruiz-Altisent |
| Daisuke Matsuura | Marián Kučera |
| Daiva Makutėnienė | Marina Indri |
| Damiano Padovani | Marina Piscopo |
| Damien Leduc | Marinko Barukčić |
| Damir Vrančić | Marius Minea |
| Dan Selisteanu | Mariya Aleksandrova |
| Daniela Chrenko | Marjan Mernik |
| Daniele Cafolla | Martin Čech |
| Daniele Desideri | Martin Marie Hubert Choux |
| Danil Ivanov | Mary Kasarda |
| Dan-Marius Dobrea | Masaki Omiya |
| Dariusz Janiszewski | Masashi Sekine |
| Datong Liu | Masoud Hemmatian |
| David McCoul | Massimo Sorli |
| David Ruiz | Mateusz Dybkowski |
| David Scaradozzi | Mathias Metzler |
| Dein Shaw | Matteo Bottin |
| De-jun Li | Matteo Verotti |
| Denis V. Makarov | Max Marian |
| Dhiraj P. Murale | Mayukh Bhattacharyya |
| Di Sun | Mehdi Hosseinzadeh |
| Dirk Romeis | Mengchu Zhou |
| Djordje Cantrak | Merlin Simo Tagne |
| Dmitry Borin | Mesut Yurukcu |
| Dmitry Filippov | Miao Li |
| Domenico Bianchi | Michael R. Koblischka |
| Domenico Pascarella | Michael Wehner |
| Dong Jiang | Michail J. Beliatis |
| Donghoon Kim | Michał Bartyś |
| Dong-Yeon Lee | Michal Jasinski |
| Doo-Hyun Choi | Michał Makowski |
| Dorota Stachowiak | Michal Puskar |
| Doru-Laurean Baldean | Michal Špiláček |
| Dragan Prsic | Mi-Ching Tsai |
| Duc-Duy Ho | Miguel Díaz-Rodríguez |
| Dušan Koniar | Mihail Ipatov |
| Dušan Krokavec | Mihăiţă Horodincă |
| Edevar Luvizotto, Jr. | Mika Salmi |
| Edgar Sokolovskij | Mike Tebyetekerwa |
| Edoardo Sinibaldi | Mikhail Belogolovskii |
| Eduardo M. G. Rodrigues | Mikko Tuohiniemi |
| Edwin En-Te Hwu | Milan Shrestha |
| Eihab M. Abdel-Rahman | Mingyang Lu |
| Eilon Faran | Minmin Zhu |
| Ekim Yurtsever | Mircea Dulău |
| Elmar Woschke | Mircea Hulea |
| Emanuele Grasso | Mircea Ivanescu |
| Emir A. Vela | Mircea-Bogdan Radac |
| Erik Prada | Mobayen Saleh |
| Erina Baynojir Joyee | Mohamad Alzayed |
| Esteban Codina | Mohamed Abdelrahem |
| Eva H. Dulf | Mohamed Trabia |
| Ewa Pawluszewicz | Mohammad Yaghoub Abdollahzadeh Jamalabadi |
| Fabio D’Andreagiovanni | Mohammed Chadli |
| Fabrizio Piergentili | Mojtaba Khanesar |
| Fei Li | Monica Tiboni |
| Felix Weber | Moon K. Kwak |
| Fernando Nuño | Mostafa Safdari Shadloo |
| Fernando Serrano | Mourad Kchaou |
| Firoz Babu Kadumudi | Muhammad Aziz |
| Florian Ion Tiberiu Petrescu | Nadir Kapetanović |
| Florin Jurca | Narayana Raju |
| Florin Mariasiu | Natalia Levashova |
| Flur R. Ismagilov | Nerija Zurauskiene |
| Francesco Cannarile | Ngoc San Ha |
| Francesco Durante | Nicolas Galopin |
| Francisco Alonso | Nikita Gabdullin |
| Francisco Beltran-Carbajal | Niko Nevaranta |
| Francisco Cruz | Nikola Lopac |
| Francisco J. Medellín-Rodríguez | Nikolaos Nikitas |
| Francisco Ureña | Norihiro Kamamichi |
| Francisco-Javier Sánchez-Romero | Nuggehalli M. Ravindra |
| Frank P. Missell | Octavian Mădălin Bunoiu |
| Frederic Melin | Octavian Narcis Ionescu |
| Galina V. Kurlyandskaya | Octavio Gutierrez Frias |
| Ganesh Shimoga | Oleksandr Dobzhanskyi |
| Gary M. Bone | Oscar Montoya |
| George Andrikopoulos | Oswaldo Horikawa |
| George Stiubianu | Oswaldo Lopez-Santos |
| Georgios Mavropoulos | Pablo Álvarez-Alonso |
| Georgios Tzounas | Pablo Rodríguez Luque |
| Ghulam Dastgeer | Pankaj Kumar Jha |
| Ghulam Hussain | Paolo Mercorelli |
| Giacomo Moretti | Paolo Paoletti |
| Gianluca Percoco | Paolo Tripicchio |
| Gianluca Rizzello | Pavel Karlovsky |
| Gianpaolo Palma | Pavel Polach |
| Gigliola Vaglini | Pawel Drozdziel |
| Giorgio Sonnino | Paweł Dymora |
| Giovanni Boschetti | Paweł Krzaczek |
| Girolamo Costanza | Pawel Zylka |
| Gisela Pujol Vazquez | Pedro Cruz |
| Giulia Scalet | Peng Hang |
| Giuseppe Carbone | Peng Hu |
| Giuseppina Uva | Peng Shi |
| Gleifer Vaz Alves | Petr Kacor |
| Goran Cirovic | Petra Amparo López Jiménez |
| Goran Gregov | Philip Buskohl |
| Gorka Urbikain Pelayo | Pietro Bilancia |
| Grzegorz Lesiuk | Piotr Gazda |
| Grzegorz Mieczkowski | Praneel Chand |
| GS Sidharth | Proloy Taran Das |
| Guangjun Liu | Pu Xie |
| Guido Belforte | Puren Ouyang |
| Guiling Yang | Qiquan Quan |
| Guillermo Valencia-Palomo | Radek Matušů |
| Guoniu Zhu | Rafael Vargas-Bernal |
| Ha Duong Ngo | Rafał Michalczyk |
| Haijun Peng | Ralf Stetter |
| Haiyang Hu | Raul Fizesan |
| Hakki Erhan Sevil | Redmond R. Shamshiri |
| Hamed Habibi | Renato Brancati |
| Hamid Beidokhti | Renato Galluzzi |
| Hamidreza Hoshyarmanesh | Ricardo Ugliara Mendes |
| Han Gardeniers | Richard Kotter |
| Hao Yan | Rimvydas Gaidys |
| Hareesh Godaba | Rituraj Rituraj |
| Harik El Houssein Chouaib | Robert Haber |
| Harshad Mishra | Robert Horvath |
| Hector Gutierrez | Robert Polasik |
| Heinrich Ruser | Robert Vrabel |
| Hichem Abdelmoula | Robert Weidner |
| Higinio Rubio Alonso | Roberto Galatolo |
| Hiroki Ishizuka | Rocco Antonio Romeo |
| Hiroki Shigemune | Rogelio Bustamante-Bello |
| Hojong Choi | Rohola Rahnavard |
| Hongliang Ren | Ronald M. Barrett |
| Hongqing Lv | Rostislav Huzlik |
| Hongtian Chen | Rubén Carlos Acevedo |
| Hsin-Jang Shieh | Rudolf Janos |
| Hugo Almeida Ferreira | Rustam Mullyadzhanov |
| Hugo Costelha | Ryszard Dindorf |
| Hugo Policarpo | Saleh Mobayen |
| Huijuan Liu | Salvatore Ameduri |
| Huiyuan Li | Sanghyun Kim |
| Hun-Chul Seo | Saoni Banerji |
| Hyun Kim | Sciarra Francesco Marotti De |
| Iacopo Tamellin | Selenia Ghio |
| Ignacijo Biluš | Seok-Kyoon Kim |
| Ignazio Dimino | Seong Han Kim |
| Igor Korobiichuk | Seong-Ik Han |
| Ilia V. Uvarov | Sergey N. Shevtsov |
| Ille C. Gebeshuber | Sergio A. David |
| Indrek Must | Seung-bok Choi |
| Inrak Choi | Sevki Cesmeci |
| Ioan Nascu | Seyed Ali Ghahari |
| Ioana Demetrescu | Seyedfakhreddin Nabavi |
| Ioan-Doré Landau | Shafiqul Islam |
| Ioan-Dragos Deaconu | Shieh-Kung Huang |
| Ioannis Kostavelis | Shigeru Ikeo |
| Ion-Cornel Mituletu | Shih-Jui Chen |
| Ionel-Alexandru Gal | Shiuhchuan Her |
| Ionica Oncioiu | Shunsuke Nansai |
| Irene Fassi | Sigitas Kilikevičius |
| Ivan Khmelnitskiy | Silu Chen |
| Ivan Lorencin | Simona Fialová |
| Ivo Boblan | Simone Quondam Antonio |
| Ivona Brajević | Slawomir Wiak |
| Jaehwan Kim | Sung Hwan Hong |
| Jaime Rodríguez | Tadahiko Shinshi |
| Jakub Bernat | Tamas Haidegger |
| Jakub Haberko | Thanh-Canh Huynh |
| Jakub Takosoglu | Tobias Hemsel |
| Ján Drgoňa | Tomas Kosan |
| Ján Kaňuch | Tomas Melin |
| Jarosław Konieczny | Tuan Anh Nguyen |
| Jasmin Jelovica | Umer Huzaifa |
| Javier Fernando Jiménez-Alonso | Vedova Matteo Davide Lorenzo Dalla |
| Javier Lopez | Vigouroux Nadine |
| Jean-Charles Mare | Vlasoula Bekiari |
| Jelle Van Loon | Xianjian Jin |
| Jérôme Coste | Xiaolong Lu |
| Jérôme De Miras | Yasuharu Koike |
| Jerzy Kasprzyk | Yingxiang Liu |
| Jerzy Rosłon | Yizhi Liu |
| Jiachun Lin | Yuichi Saito |
| Jiahao Chen | Yuri B. Shtessel |
| Jiajie Kang | Yuri Fetisov |
| Jianbin Liu | Yury Rafailovich Nikiti |
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