We aimed to examine the effect of nutrient inputs from a point source on the elemental stoichiometry of the stream benthic community. We analyzed C, N, and P contents and calculated stoichiometric ratios of water, macroinvertebrates and their potential food resources in two reaches located above and below a point source input in La Tordera stream (Catalonia, NE Spain). Periphyton and mosses had similar stoichiometric ratios in the two reaches. Filamentous algae had a similar C:N ratio in the two reaches, but the C:P ratio was lower below than above the point source. Stoichiometric ratios of CPOM, FPOM, and SPOM decreased considerably below the point source. Differences in elemental stoichiometry between the two reaches were highly variable among macroinvertebrate taxa. Elemental ratios decreased below the point source for Elmidae, Lumbriculidae and Physa sp., but increased for Calopteryx virgo, Serratella ignita and Chironominae, and were similar for Hydropsyche instabilis and Baetis sp. Elemental ratios of functional feeding groups were not significantly different between the two reaches. Major stoichiometric differences between the two reaches were associated to the relationship between consumers and their food resources. The elemental imbalances between consumers and resources decreased below the point source input.