This article investigates whether sustainability labels for mutual funds in Europe provide consistent signals regarding funds’ sustainable characteristics. Specifically, we assess the alignment of signals conveyed by third-party and self-declared labels. Among the first typology, we consider labels sponsored by government and nonprofit organizations (GNPOs) alongside Environmental, Social, and Governance (ESG) ratings from commercial data vendors. The latter category includes the Sustainable Finance Disclosure Regulation (SFDR) classification and an ESG-related name. Our findings indicate that equity funds with GNPO labels are (...) more likely to exhibit top-tier ESG ratings and alignment with self-declared sustainability signals, namely Article 9 of SFDR and fund names. Furthermore, holding government and multiple GNPO labels is linked to other signals indicating higher sustainability standards. In addition, funds tend to experience an improvement in Morningstar globes after receiving a GNPO label, consistent with GNPO labels signaling funds of the high-quality type. The results regarding label alignment in fixed-income funds are less conclusive. Our findings underscore the need for credible signals in view of the growing number of sustainability labels available to investors. (shrink)