| 2021 | Leveraging Multi-Faceted User Preferences for Improving Click-Through Rate Predictions. | Pan Li |
| 2021 | Analyzing Item Popularity Bias of Music Recommender Systems: Are Different Genders Equally Affected? | Oleg Lesota, Alessandro B. Melchiorre, Navid Rekabsaz, Stefan Brandl, Dominik Kowald, Elisabeth Lex, Markus Schedl |
| 2021 | RecSys 2021 Tutorial on Conversational Recommendation: Formulation, Methods, and Evaluation. | Wenqiang Lei, Chongming Gao, Maarten de Rijke |
| 2021 | Learning to Match Job Candidates Using Multilingual Bi-Encoder BERT. | Dor Lavi |
| 2021 | Personalised Outfit Recommendations: Use Cases, Challenges and Opportunities. | Nick Landia |
| 2021 | Recommendations and Results Organization in Netflix Search. | Sudarshan Dnyaneshwar Lamkhede, Christoph Kofler |
| 2021 | Team JKU-AIWarriors in the ACM Recommender Systems Challenge 2021: Lightweight XGBoost Recommendation Approach Leveraging User Features. | Alexander Krauck, David Penz, Markus Schedl |
| 2021 | Soliciting User Preferences in Conversational Recommender Systems via Usage-related Questions. | Ivica Kostric, Krisztian Balog, Filip Radlinski |
| 2021 | Towards an Experimental News User Community as Infrastructure for Recommendation Research (abstract). | Joseph A. Konstan, Robin Burke, Edward C. Malthouse |
| 2021 | A Payload Optimization Method for Federated Recommender Systems. | Farwa K. Khan, Adrian Flanagan, Kuan Eeik Tan, Zareen Alamgir, Muhammad Ammad-ud-din |
| 2021 | Jointly Optimize Capacity, Latency and Engagement in Large-scale Recommendation Systems. | Hitesh Khandelwal, Viet Ha-Thuc, Avishek Dutta, Yining Lu, Nan Du, Zhihao Li, Qi Hu |
| 2021 | Fairness in Reviewer Recommendations at Elsevier. | Daniel James Kershaw, Rob Koeling, Stephan Bourgeois, Antonio Trenta, Harriet J. Muncey |
| 2021 | Investigating Overparameterization for Non-Negative Matrix Factorization in Collaborative Filtering. | Yuhi Kawakami, Mahito Sugiyama |
| 2021 | Recommender Systems for Personalized User Experience: Lessons learned at Booking.com. | Ioannis Kangas, Maud Schwoerer, Lucas J. Bernardi |
| 2021 | Horizontal Cross-Silo Federated Recommender Systems. | Saikishore Kalloori, Severin Klingler |
| 2021 | Global-Local Item Embedding for Temporal Set Prediction. | Seungjae Jung, Young-Jin Park, Jisu Jeong, Kyung-Min Kim, Hiun Kim, Minkyu Kim, Hanock Kwak |
| 2021 | Learning to Represent Human Motives for Goal-directed Web Browsing. | Jyun-Yu Jiang, Chia-Jung Lee, Longqi Yang, Bahareh Sarrafzadeh, Brent J. Hecht, Jaime Teevan |
| 2021 | Top-K Contextual Bandits with Equity of Exposure. | Olivier Jeunen, Bart Goethals |
| 2021 | Pessimistic Reward Models for Off-Policy Learning in Recommendation. | Olivier Jeunen, Bart Goethals |
| 2021 | Workshop on Recommender Systems in Fashion and Retail. | Shatha Jaradat, Nima Dokoohaki, Humberto Jess Corona Pampn, Reza Shirvany |
| 2021 | Group Decision Making and Group Recommender Systems. | Anthony Jameson |
| 2021 | Knowledge-Based Recommendations for Climbers (Short paper). | Iustina Ivanova, Marina Andric, Francesco Ricci |
| 2021 | Statistical Inference: The Missing Piece of RecSys Experiment Reliability Discourse. | Ngozi Ihemelandu, Michael D. Ekstrand |
| 2021 | Privacy Preserving Collaborative Filtering by Distributed Mediation. | Alon Ben Horin, Tamir Tassa |
| 2021 | ConvEx-DS: A Dataset for Conversational Explanations in Recommender Systems. | Diana C. Hernandez-Bocanegra, Jrgen Ziegler |