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Kagamine Rin (鏡音リン) and Kagamine Len (鏡音レン) are the second Vocaloid2 voicebanks released by Crypton Future Media, and the fourth CFM voicebank overall. They are a unique product since they are sold with not one voicebank but two, one for Rin and one for Len. But because there were issues with their voicebanks they where re-released as Rin and Len Act 2. They also have their own Append voicebanks.

They are both blond haired and blue eyed, they wear sailor style school uniforms with arm and leg warmers. Each has their own headset.

It has never been confirmed if the characters are mirror images, siblings, friends, lovers, because that's up fan interpretation.