Ruud Janssen (born 29 July 1959 in Tilburg) is a Dutch Fluxus and mail artist currently living in Breda in the Netherlands.

in a special double issue of the journal Visible Language on Fluxus.

[5][6] Janssen publishes articles, magazines and booklets with his TAM-Publications and participates in international mail art projects, collaborations and exhibitions.

He founded IUOMA (International Union of Mail-Artists) in 1988 and is also the curator of the TAM-Rubberstamp Archive, the result of a Mail Art collection that has been accumulated by him from 1983 till now.

The archive[7] contains art prints, original rubber stamps, magazines and literature.