Oxidative stress induced damage of the retinal pigment epithelium (RPE) together with chronic inflammation has been suggested as major contributors to retinal diseases. Here, we examine the effects of oxidative stress and endogenous complement components on the RPE and its proinflammatory and proangiogenic responses. The RPE cell line, ARPE-19, treated with H2O2 reduced cell-cell contacts, increased marker for epithelial mesenchymal transition but showed less cell death. Stressed ARPE-19 cells increased the expression of complement receptors CR3 and C5aR1. CR3 was co-localized with cell-derived complement protein C3, which was observed in its activated form in ARPE-19 cells. C3 as well as its regulators CFH and properdin accumulated in ARPE-19 cells after oxidative stress independent from external complement sources. This cell associated complement accumulation promoted nlrp3 and foxp3 expression and subsequent increased secretion of proinflammatory and proangiogenic factors. The complement-associated ARPE-19 reaction to oxidative stress, independent from external complement source, was increased by using the PARP inhibitor olaparib. Our results indicated that RPE cell-derived complement proteins and receptors are involved in RPE cell homeostasis following oxidative stress and should be considered as targets for treatment developments for retinal degeneration.