Robert Sebastian Andrzejuk (born July 17, 1975 in Wroclaw, Dolnoslaskie) is a Polish fencer who won a silver medal in Men's Team Épée (Fencing) at the 2008 Summer Olympics in Beijing, together with Tomasz Motyka, Adam Wiercioch, and Radoslaw Zawrotniak.
For his sport achievements, he received: Golden Cross of Merit in 2008.