Ideler Santiago Tonelli (18 December 1924 – 10 August 2016) was an Argentine lawyer and politician.
He served as Minister of Labor from 1987 to 1989, during the presidency of Raúl Alfonsín.
Born on 18 December 1924 in Bragado, Buenos Aires, he became a lawyer after passing the civil service exam.
In that position, he wrote the Law of Due Obedience, which placed the responsibility for the crimes of the dictatorship on military commanders.
His son, Pablo Tonelli, is a national deputy.