Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Smart Cities maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 15 days and the median time to publication was 38.5 days. The editors would like to express their sincere gratitude to the following reviewers for their precious time and dedication, regardless of whether the papers were finally published:
| Abubakar, Ismaila Rimi | Kondor, Dániel |
| Adegbohun, Feyijimi | Kostrzewski, Mariusz |
| Al-Aboosi, Fadhil | Koswatte, Saman |
| Aliberti, Alessandro | Laaksonen, Hannu |
| Allam, Zaheer | Lai, Loi Lei |
| Allwinkle, Sam | Lalović, Ksenija |
| Alvear A., Oscar | Langendijk, Gaby S. |
| Amditis, Angelos | Laurini, Robert |
| Andújar-Montoya, María Dolores | Leng, Jiewu |
| Arabzadeh, Vahid | Lim, Sejoon |
| Arce-Ruiz, Rosa | Lin, Will Y. |
| Arcos-Aviles, Diego | Liu, Jiangtao |
| Arroyo Ohori, Ken | Liu, Kangli |
| Astarita, Vittorio | Liu, Tao |
| Aulet, Silvia | Lizarraga, Carmen |
| Azamathulla, H. Mohammad | Lobato, Killian |
| Azevedo Guedes, André Luis | Lock, Oliver |
| Azzedin, Farag | López Díaz, Alfonso Isidro |
| Badii, Claudio | López González, Alejandro |
| Baloian, Nelson | Lupi, Lucia |
| Baltac, Vasile | Lwin, Ko Ko |
| Bamwesigye, Dastan | Maheshwari, Zeel |
| Bandeira, Jorge | Matei, Ani |
| Bañón, Luis | McNutt, John |
| Baraković Husić, Jasmina | Meltzer, Monika |
| Barreto, Luis | Mieg, Harald |
| Barro, Pape Abdoulaye | Mihailescu, Marius Iulian |
| Barz, Cristian | Mihelj, Jernej |
| Bauder, Michael | Mocnik, Franz-Benjamin |
| Bekebrede, Geertje | Molin, Eric |
| Bell, Daniel | Musco, Francesco |
| Bhosekar, Vijay | Musolino, Giuseppe |
| Bizon, Nicu | Mylonas, Alexios |
| Borruso, Giuseppe | Nasri, Arefeh |
| Botte, Marilisa | Ndibanje, Bruce |
| Bouzguenda, Islam | Neureiter, Christian |
| Burov, Angel Petrov | Niccolai, Alessandro |
| Cano-García, José Manuel | Nielsen, Per Sieverts |
| Capone, Francesco | Nikolić Topalović, Marina |
| Castro-Jul, Fátima | Noriega, Leocundo Aguilar |
| Cavada, Marianna | Nussbaum, Brian |
| Cavallo, Aurora | Ochoa-Zezzatti, Alberto |
| Celani, Alberto | Okoro, Chioma |
| Cesari, Daniela | Olfat, Hamed |
| Cetean, Valentina | Olszewski, Robert |
| Cheng, Bin | Onishi, Viviani |
| Chianese, Elena | Özdemir, Alp |
| Chiariotti, Federico | Padoa-Schioppa, Emilio |
| Chiciudean, Gabriela | Palladino, Rosa |
| Chipman, Jonathan | Pereira, Lucas |
| Chmielewska, Marta Ewa | Pereira, Pedro |
| Chowdhury, Dhiman | Pezzutto, Simon |
| Chrysoulas, Christos | Pierce, Paul |
| Cirillo, Flavio | Piras, Andrea |
| Coates, Stephen | Pizzuti, Stefano |
| Coca-Stefaniak, J. Andres | Poza-Lujan, Jose-Luis |
| Colding, Johan | Prati, Ronaldo |
| Corazza, Maria Vittoria | Qamar, Shamimul |
| Cristófol-Rodríguez, Francisco-Javier | Rana, Soumya Prakash |
| Cugurullo, Federico | Rashid, Mizanur |
| Cupiał, Michał | Rice-Davis, Charles |
| Dang, Tri Nguyen | Rizwan, Muhammad |
| De Los Santos, Alicia | Robert, Jérémy |
| De Oliveira, Leise Kelli | Robitaille, Eric |
| Diez Blanco, Luis Enrique | Roccotelli, Michele |
| Díez, Luis Francisco | Rodrigues-Soares, Jakson Renner |
| Doost Mohammadian, Hamid | Różycki, Pawel |
| Drago, Carlo | Salah, Khaled |
| Dung, Nguyen Dinh | Salvalai, Graziano |
| Dupont, Laurent | Sanchez Lasheras, Fernando |
| Eckersley, Peter | Sant’Ana, Jean |
| Elsts, Atis | Santos, Rodrigo |
| Fasolino, Isidoro | Sayegh, Marderos |
| Ferraris, Alberto | Schelly, Chelsea |
| Fidalgo, José Nuno | Schipper, Ron |
| Förster, Anna | Shafique, Muhammad |
| Franceschini, Marston Héracles Domingues | Shittu, Ekundayo |
| Gachet Paez, Diego | Silva, Ivanovitch |
| Gagliardi, Isabella | Simpson, Isabelle |
| Gallo, Francesco | Skowera, Barbara |
| Garau, Chiara | Soder, Michael |
| García-Fuentes, Miguel Á. | Spears, Steven |
| Garrido-Velarde, Jacinto | Staricco, Luca |
| Gaska, Krzysztof | Suciu, George |
| Georgiadis, Teodoro | Syrjä, Pasi |
| Georgiou, Orestis | Szmelter-Jarosz, Agnieszka |
| Gercek, Cihan | Tan, Teck-Boon |
| Ghani, Arfan | Terzano, Kathryn |
| Gianoli, Alberto | Tomal, Mateusz |
| Gioia, Ciro | Tomalty, Ray |
| Gonçalves, Jorge | Torrisi, Vincenza |
| González-Briones, Alfonso | Trakadas, Panagiotis |
| Grabner, Miha | Trincone, Barbara |
| Grimaldi, Didier | Tsukada, Manabu |
| Guchhait, Rekha | Tundys, Blanka |
| Guido, Giuseppe Piero | Tunon, Hakan |
| Gürerk, Özgür | Ullah, Fahim |
| Hassanain, Mohammad | Valogianni, Konstantina |
| Hassani, Hossein | Varady, Geza |
| Herman, Krzysztof | Vasileva, Roza |
| Hernández-Callejo, Luis | Venco, Elisabetta Maria |
| Hu, Richard | Vidović, Danko |
| Huovila, Aapo | Villegas-Ch, William |
| Hynes, Mike | Viman, Liviu |
| Ilovan, Oana-Ramona | Vinueza Naranjo, Paola Gabriela |
| Ioakimidis, Christos | Visvizi, Anna |
| Isam, Shahrour | Vitalis, Stelios |
| Ivey, Cesunica E. | Vokoun, Marek |
| Janmaimool, Piyapong | Volkova, Anna |
| Javed, Barkha | Walletzký, Leonard |
| Jerman, Andrej | Wang, Hao |
| Jiang, Mingzhe | Wang, Yi |
| Jones, Jeffery A. | Weng, Shao-Jen |
| Karabegovic, Almir | Wiora, Józef |
| Karamitsos, Ioannis | Wohner, Bernhard |
| Karczmarczyk, Artur | Wu, Chih-Da John |
| Kavadias, Kosmas | Yñiguez, Rocío |
| Kavroudakis, Dimitris | Yook, Donghyung |
| Kennedy, William G. | Yoshida, Shingo |
| Khajeheian, Datis | Youssef, Tarek |
| Khan, Murad | Zak, Andrzej |
| Kharrazi, Ali | Zalamea, Esteban |
| Kim, Younhee | Zanon, Bruno |
| Kirby, Andrew | Zhang, Yongming |
| Kłos, Marcin | Zhang, Zhe |
| Koelmel, Bernhard | Zoha, Ahmed |
| Komnata, Konrad | Zoppi, Corrado |
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