Abstract: This dataset presents the major, trace elements, Sr-Nd-Pb, O and Li isotopic compositions of arc lavas from Kamchatka published and cited in Liu et al. (2020). The published Li isotopic compositons of mantle xenoliths from Kamchatka are also shown for comparision. Other Description: Liu, H., Xiao, Y., Sun H., Tong, F., Heuser, A., Churikova, T., Wörner, G., (2020) Trace elements and Li isotope compositions across the Kamchatka arc: Constraints on slab-derived fluid sources. Journal of Geophysical Research-Solid Earth