| Name | Source | Type | |
|---|---|---|---|
| Raas | Master of Orion III | ||
| Rabotevs | Harry Turtledove's Worldwar book series | A subject species of the Race in the Worldwar book series | |
| Amoeboid | |||
| Harry Turtledove's Worldwar book series | Reptilian, often called "Lizards" by humans due to their appearance. | ||
| Mass Effect | |||
| Radicles | OK K.O.! Let's Be Heroes | ||
| Raiel | Peter F. Hamilton's Pandora's Star | ||
| Rako-Gorda | Utopia | ||
| Ram Pythons | Battlelords of the 23rd Century | ||
| Rancors | Star Wars | ||
| Raptors | |||
| Doctor Who | |||
| Reapers | Doctor Who | ||
| Mass Effect | |||
| Relgarians | Farscape | Humanoid | |
| Remans | Star Trek | Humanoid | |
| Stargate SG-1 | Humanoid | ||
| Stargate SG-1 | Artificial lifeform. Two variants are known to exist, in a small mechanical insect shape as well as full humanoid. | ||
| Stargate SG-1 | |||
| Rigellians | Lensman books | Barrel-shaped with four tentacular arms and four stubby legs | |
| Rigellians (including Kang and Kodos) | The Simpsons | ||
| Rills | Doctor Who | ||
| Expedition | |||
| Rimmer | Red Dwarf | Hologram-humanoid | |
| Star Trek | Risians are extremely open and will freely share their planet, and even themselves, with vacationers – a practice known as "Jamaharon". | ||
| Robotech | |||
| Rodians | Star Wars | ||
| American Dad! | |||
| Red Dwarf | Humanoid | ||
| Romulans | Star Trek | Humanoid | |
| Doctor Who | |||
| Ryouko Asakura | The Melancholy of Haruhi Suzumiya | Humanoid interface | |
| Ryqril | Timothy Zahn's The Blackcollar |