Clemens Bollen (born 12 February 1948 in Langholt, Leer) is a German politician and member of the SPD.
After graduating from secondary school in 1965, Bollen trained as an industrial clerk until 1968. He then worked as an employee in human resources at the Olympia-Werke in Leer until 1979. There he was also deputy chairman of the works council and a member of the central works council. Bollen was the first authorized representative of IG Metall Leer/Papenburg since 1980.