Antarctic krill (<em>Euphausia superba</em>, hereafter "krill") are an important component of Southern Ocean food webs, are efficient in sequestering carbon and support a major fishery. Knowledge of their early life cycle is key to understanding krill population dynamics and essential for fisheries management in a warming climate. Many data have been collected over the years on the distribution of krill larvae, but the data remain fragmented and hard to re-use. Here we have put these disparate data sources together into a large database of 10,762 net-sampling records with numerical abundance data on the various larval stages. This new <em>KRILLBASE-larvae</em> database complements two existing and circumpolar KRILLBASE open-access databases, namely <em>KRILLBASE-abundance</em> (numerical abundance of postlarval krill and salps) and <em>KRILLBASE-length frequency</em> (length, sex and maturity stage of postlarval krill). By completing the set to include larvae, we provide datasets that can underpin a more holistic appreciation of krill dynamics; for example to model the krill life cycle, population dynamics, response to climate change and to help manage the krill fishery. <em>KRILLBASE-larvae</em> is circumpolar, albeit with most data concentrated in the SW Atlantic sector which appears to be the major spawning ground and where the fishery operates. The data span 1926–2024 with >50 seasons of coverage spanning two epochs: 1926–1937 and 1976–2024. The database is based on net haul data on densities (numbers per m<sup>-2</sup>) of eggs, nauplii, metanauplii, calypotope- and furcilia stages, alongside key sampling information such as sampling depths, net type, net mesh size, water depth, temperature etc. This data paper provides a description of <em>KRILLBASE-larvae</em>, mapping data coverage in terms of space, time and sampling depth, providing pointers and caveats to its use. The KRILLBASE-larvae database is available here for reviewers: <a href="http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=946546c8-b24f-422f-96e1-3bd872506c5f" target="_blank" rel="noopener">http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=946546c8-b24f-422f-96e1-3bd872506c5f</a> with user id reviewer_02221 and password VchJWSANpH1T5Wpj with instructions <a href="https://www.bas.ac.uk/data/polar-data-centre/reviewer-access/" target="_blank" rel="noopener">https://www.bas.ac.uk/data/polar-data-centre/reviewer-access/</a> [Pending publication and any subsequent amendment on review, the final dataset will be freely available with a doi and single click to download]. We request that this data doi and the data paper are cited when the data are used.