Parramatta Eels

Canterbury-Bankstown is generally considered to be Parramatta's biggest rivals: as well as being located in close geographical proximity to each other, the 2 sides have also met in several notable finals match-ups throughout the 1980's, 1990's, and 2000's. Throughout the 1980's, the 2 clubs were among the strongest in the NRL, winning a combined 8 premierships across the decade; they met in 2 grand finals in that period, winning one apiece.

Other major rivalries are those that Parramatta shares with fellow New South Wales sides the Manly-Warringah Sea Eagles and the Penrith Panthers. The rivalry with the Sea Eagles developed throughout the 1970's and 1980's, whilst the Parramatta-Penrith rivalry - often dubbed the Western Sydney Derby - has its origins in the 1950's and 1960's, with recent clashes, including the 2022 grand final, intensifying the rivalry.

A more recent Parramatta Eels rivalry is that shared with the Melbourne Storm. After the Victoria side was found guilty of breaching the NRL's salary cap between 2006 and 2010, Parramatta was among the sides which felt they had been denied a rightful premiership; notably physical encounters followed in subsequent seasons, and the sides have also met several times in the finals since.

Other rivalries include the Eels-Dragons rivalry, which developed as both sides competed for premierships in the 2000's and early 2010's.