The protest was called by federal prosecutors and attended by Alberto Nisman’s family and opposition politicians.
They defied torrential rain to demand justice for Alberto Nisman, who had been investigating the government.
Prosecutor Alberto Nisman was found dead in his apartment on 18 January.
It is still not clear whether he killed himself or was murdered.
Alberto Nisman was investigating Argentina’s deadliest terrorist attack, the 1994 bombing of the Amia Jewish centre.
The silent march was called by prosecutors demanding a full investigation.
Alberto Nisman’s ex-wife, federal judge Sandra Arroyo Salgado, and their two daughters joined the demonstration, which lasted nearly two hours.
Similar protests took place across the country.
Argentines living in Spain, France, Israel and other countries also gathered to demand justice for Alberto Nisman.
Officials have denounced the march as a political move to weaken the government.
Alberto Nisman was found with a bullet wound to the head and a gun was lying next to him.
Days earlier, he had published a 300-page report in which he accused President Cristina Fernandez de Kirchner and Foreign Minister Hector Timerman of covering up Iran’s alleged role in the bombing.
His body was found just hours before he was due to appear before a congressional committee to present more details of his allegations.
News of Alberto Nisman’s death and its timing led to speculation among some Argentines that the government may have played a role in it.
The government has strongly denied both allegations.
In an open letter published on her website, President Cristina Fernandez de Kirchner suggested rogue intelligence agents had fed Alberto Nisman false information in order to destabilize her government.
She also said she was convinced Alberto Nisman’s death was not suicide.
Days later, the president announced she planned to dissolve Argentina’s intelligence service, SI.
Critics said the move was aimed at diverting attention away from Alberto Nisman’s death.
9VgM9hfQw8wAt least 158 people have died in Spain's worst flooding disaster in generations. On October…
Google has been fined two undecillion (a two followed by 36 zeroes) roubles by a…
Embarking on a home remodel is an exciting journey, promising enhanced comfort, increased property value,…
The US presidential candidates continued to campaign across key swing states on October 20. Footage…
Elon Musk has said he will give away $1 million a day to a registered…
India and Canada have decided to expel their top envoys along with other diplomats as…
