In this first volume of SIBFS-ESEP, we establish a stable isotope dataset of benthic foraminifera of surface marine sediments (Benga-Rose stained and unstained) from the continental margin off Peru and Chile (Equatorial and Southeast Pacific). The surface sediment samples were collected between 1962 and 2018 at span depths of 24 to 3964 meters and latitudes from 12°S to 51°S. The samples were obtained using multicorer (Sonne 102, Sonne 156, Sonne 211, CRIO1104, RR-9702a, M77, M92), gravity core (Sonne 161), and a Petersen grab (USNS Eltanin PG4, Crio1812). The species that this data set cover are Lobatula wuellerstorfi, Planulina ornata, C. mundulus, L. ungerianus, L. lobatula, Bolivina interjuncta, B. plicata, B. seminuda, B. costata, B. spissa, Uvigerina auberiana and U. peregrina. The data set summarised location of the sample, cm where the benthic foraminifera were picked, measurements of d13C and d18O (per mil) with their respective analitical stdev (if apply), size of sieve used during the foraminifera picking process, number of individuals used for analysis, selected for analysis, Benga-Rose stained status of the individuals analyzed, notes about the state of preservation of the selected individuals, pre-treatment of cleaning before analysis, stable isotope laboratory where the samples were measurement, machine used for the analysis, flag 1 (notes about the age of the sediments, signals of reworking and stable isotope analysis concerns).