Ahmed Seif El-Islam (Arabic: أحمد سيف الاسلام; 9 January 1951 – 27 August 2014) was an Egyptian communist, human rights activist and lawyer.

While serving a five-year sentence in prison for a free speech case, he earned a degree in law from Cairo University in 1989.

In 2008, Seif was part of the team defending 49 persons, who were tried before the high State Security Court in Tanta, North Cairo.

The protest was in solidarity with the Mahala workers strike, which was primarily in the state-run textile industry, in response to low wages and rising food costs; however, violent clashes between the police and protestors took part.

After the 25 January uprising, Seif was a member of the Personal Liberty Protection Commission, which was formulated by Presidential Decree number 5 for 2012.

Two of his three children – Alaa Abd-elFattah and Sanaa Seif - were unable to visit their father in hospital because they had been jailed for taking part in protests against the law banning unsanctioned demonstrations.