|This article is about a/an rider form used by several identities in the Kamen Rider Series.|
Kamen Rider 3 (仮面ライダー3号 Kamen Raidā Sangō) may refer to any the following characters.
In the forms of media that Kamen Rider 3 has appeared, his appearance was quite different. The original Kamen Rider 3 was designed by Shotaro Ishinomori, he continued to use his "Double Riders style" design and then added some red line between two white lines on Rider 3's body side. But the rebooted version, designed by Hideki Tajima, not only changed the main color but also used a racer motif and made him looks wilder.
- Like the Double Riders, Kamen Rider 3 also having a nickname "#3 of Fantasy" (幻の3号 Gen no Sangō).