Forecast constraints on the matter density parameter Ω_m and the dark energy equation of state w in a wCDM cosmological model from a measurement of the void-galaxy CCF with Euclid as outlined in this work (red contours), corresponding to . We also show previous forecasts for the Euclid void-galaxy CCF – obtained using a different model and measurement method – by Hamaus et al. (2022), for the ‘independent’ (green contours) and ‘calibrated’ (blue, labelled ‘cal.’ here) cases in that paper, corresponding to whether nuisance parameters are marginalised over or fixed. For context, we show current measurements from current BAO and ‘full-shape’ measurements in the SDSS galaxy, quasar and Lyman-α datasets from the MGS, BOSS and eBOSS surveys (yellow) presented by Cuceu et al. (2023).