R4: Ridge Racer Type 4[a], released without the 'R4' prefix in PAL territories, is a 1998 racing video game developed and published by Namco for the PlayStation.

Maintaining the arcade-style gameplay of its predecessors, R4: Ridge Racer Type 4 introduces a new Grand Prix, named Real Racing Roots '99, consisting of four teams that the player may join, with associated sponsorships that can also be chosen, each offering different effects to the driving.

It received a highly positive reception with praise going to its presentation, art, driving, and soundtrack, though some criticism went to its cars' overly light drifting compared to earlier titles in the series.

Developmental staff members commented that much "waste" was removed in order to make Gouraud shading and high polygon counts possible.

Similarly to the critically acclaimed Gran Turismo at the time, R4: Ridge Racer Type 4 made use of SCE's Performance Analyser devkit.

A handful of tracks in the game, including the theme song "Ridge Racer (One More Win)", feature vocals by American singer Kimara Lovelace.

Okubo first discovered her at a club event in Nishi-Azabu in May 1998; he was impressed by her powerful voice, and felt she fitted the game direction's keywords of "urban" and "cool".

[7] The music was designed to correspond with the game's human drama, so the composers aimed to evoke emotions of sadness and tension in their tracks.

Takahashi described him as "the gatekeeper to club sound hell",[8] while Okubo took piano parts from one of Sakai's tracks and reworked it into "Quiet Curves",[7] much to her annoyance.

[23] Keith Stuart of Official UK PlayStation Magazine in its preview gave a strongly positive reception to the game design such as light and shadow effects.

[5] He also added in comparison to other racers: "Not everyone enjoyed the obsessive intricacy and detail of Gran Turismo, but many found sub-arcade fare like Motorhead lacking in substance.