Soldier of Fortune (SOF), subtitled The Journal of Professional Adventurers, is a daily American web magazine founded in 1975 by Robert K. Brown.

In May 2022, author, editor, and security journalist Susan Katz Keating bought the publication from Brown with the help of her partner Pierre Hollis.

[4] After retiring from active duty, Brown began publishing a “circular”, magazine-type publication with few pages which contained information on mercenary employment in Oman, which had recently undergone a coup and was battling a communist insurgency.

[7] In 2018, American historian Kyle Burke described the popularity of Soldier of Fortune as due to a white male backlash against the rise of feminism and the rise of civil rights movement, as he noted that the majority of the readers of Soldier of Fortune were white men who resented feminists and "uppity" non-white people, especially African Americans.

Good Rhodesian beer, a friendly populace, and what I would describe as a free and easy, unhurried way of life, lots of wide open spaces".

[15] One of the first Americans to go to Rhodesia was John Alan Corey, a veteran of the Vietnam war who joined the Rhodesian Light Infantry Regiment and who was killed in action in July 1975.

[20] The assignment was meant to provide the Reagan administration with the necessary "plausible deniability" that it was not attempting to circumvent Congress, which had banned assistance to the Contras.

Singlaub retired from the U.S. Army in 1979, but he was working unofficially for the National Security Council in the 1980s, which he bombarded with various plans to overthrow the Sandinistas.

[26] In the online magazine, publisher Keating revived original reporting, and sent correspondents into the field in Ukraine, Serbia, Israel, and along the southern U.S. border with Mexico.

[27] Among those whose stories appear in the section are Gen.(Ret) Scott Miller, formerly the four-star general in charge of U.S. forces in Afghanistan [28] and Jan Scruggs, founder of the Vietnam Memorial Wall,[29] along with numerous warfighters and veterans.

[30] The magazine gained publicity in July 2023 when Keating published her investigative series on the cocaine packet that was discovered inside the Biden White House.

[34] During the late 1980s, Soldier of Fortune under Robert K. Brown was sued in civil court several times for having published classified advertisements by private "guns for hire."

In 1989, Sandra Black's son Gary and her mother Marjorie Eimann filed a wrongful-death lawsuit against SOF magazine and its parent publishing company Omega Group Ltd., seeking $21 million in redress of their grievance.

The jury found the defendants grossly negligent in publishing Hearn's ad for implicit illegal activity (murder) and awarded the plaintiffs $9.5 million in damages.

In 1990, the United States Court of Appeals for the Fifth Circuit reversed the verdict, saying that the standard of conduct imposed upon the magazine was too high because the advertisement was ambiguously worded.

In 1992, the United States Court of Appeals for the Eleventh Circuit upheld the judgment of the jury, saying "the publisher could recognize the offer of criminal activity as readily as its readers did.