The latest group, including eight women and two freelancers, represents a fraction of the dozens of journalists killed last year on the job but aims to draw public attention to the dangers faced those pursuing the news around the world.
The 18 who died “represent the much larger threat to all journalists, who face unprecedented dangers as they strive to provide information about our society, often in countries where press freedom is imperilled or nonexistent,” said Jan Neuharth, chief executive of the Freedom Forum, the parent organisation of the Newseum.
The memorial wall which was created two decades ago bears the name of more than 2,300 who died in news-gathering since 1835.
The latest group honoured included Christopher Allen, a 26-year-old US freelancer shot in the head during a battle between the South Sudanese army and rebels. Government officials claimed he was not targeted.
Also included was Maltese investigative journalist Daphne Caruana Galizia, killed by a car bomb last October as she lifted the lid on widespread corruption in the Mediterranean country.
Added to the wall were two Mexican journalists slain following their investigations of drug cartels: Javier Valdez, the founder of weekly newspaper Riodoce, shot outside his offices; and Miroslava Breach, a veteran crime and politics reporter found dead inside her car with gunshot wounds to the head.
Holly Williams, a CBS News correspondent who spoke at the ceremony, said those honoured showed remarkable bravery in the face of adversity.
Williams said a number of the journalists killed “went about their work knowing that in doing so they were making themselves targets, and I’m humbled by that because it must take a kind of courage that I find frankly unimaginable.”
Others listed on the memorial included Mohamed Abazied, Hawker Faisal Mohammed and Dilshan Ibash (killed in Syria); Shifa Gardi, Arkan Sharifi, Stéphane Villeneuve and Véronique Robert (Iraq); Sudip Dutta Bhaumik and Gauri Lankesh (India); Nikolai Andrushchenko (Russia); Yameen Rasheed (Maldives); María Efigenia Vásquez Astudillo (Colombia); Kim Wall (Denmark); and Christopher Iban Lozada (Philippines).