| Author(s) | Organization(s) | Session |
| Lang, André | Insius, Germany | Text Mining and NLP |
| Lange, Benjamin P. | Julius-Maximilians-Universität Würzburg, Germany | Social Media and Online Communities |
| Lauer, Mario | Süddeutsche Zeitung GmbH | GOR Best Practice Award 2019 Competition I |
| Laupper, Ellen | Swiss Federal Institute for Vocational Education and Training SFIVET, Switzerland | Push-to-web and Recruitment Presenter |
| Lehmann, Jasmin | Technische Universität Ilmenau, Germany | GOR Thesis Award 2019 Competition: Bachelor/Master Presenter |
| Leiendecker, Felix | YouGov Deutschland GmbH, Germany | Data Systems instead of Ad Hoc Research? Presenter |
| Lemcke, Johannes | Robert Koch Institut, Germany | Poster Session (Part II) Presenter |
| Lessof, Carli | Southampton University, United Kingdom | Using Smartphone Data for Social Science Research Presenter |
| Lin, Ji-Ping | Academia Sinica, Taiwan | Poster Session (Part II) Presenter |
| Lindgren, Elina | University of Gothenburg, Sweden | Scales and Don't Know Answers |
| Loebbecke, Claudia | University of Cologne, Dept. of Media and Technology Mgmt., Cologne, Germany | Fake News, Fake Users Presenter |
| Lück, Detlev | Federal Institute of Population Reserach (BiB), Germany | Mixing the Modes |
| Lugtig, Peter | Utrecht University, Netherlands | Mixing the Modes New Technologies and Human-like Interviewing |
| Lundmark, Sebastian | University of Gothenburg, Sweden | Scales and Don't Know Answers |
| Lütters, Holger | HTW Berlin, Germany | GOR Best Practice Award 2019 Competition II Presenter |
| Luzsa, Robert | Universität Passau, Germany | Poster Session (Part II) Presenter |