Kurt Gustav Wilckens (November 3, 1886 – June 15, 1923) was a German anarchist, known in Argentina for having avenged the massacre of hundreds of workers on strike in the repression unleashed by the Argentine government in response to the prolonged Patagonia rebelde labor uprising.

Wilckens assassinated Lieutenant Colonel Héctor Benigno Varela, the military leader in charge of the brutal repression.

On the night of 15 June 1923, prison guards smuggled in Jorge Ernesto Pérez Millán Témperley [es], a former police sergeant who was a member of the Argentine Patriotic League, a far-right political party formed after the strike.

A protest rally was held by the Free Workers' Union of Germany, and widespread strikes occurred in Argentina.

However, on 9 November 1925, Millán himself was mortally wounded by Esteban Lucich, a mentally unstable anarchist and convicted murderer who'd been working for him as a servant.