Reynhard "Rey" Tambos Maruli Tua Sinaga[note 1] (born 19 February 1983)[4] is an Indonesian serial rapist who was convicted of 159 sex offences, including 136 rapes of young men, committed in Manchester, England, between 2015 and 2017, where he was living as a student.

Sinaga was found guilty of drugging and sexually assaulting 48 men during this period, 44 of whom he raped, some repeatedly, although police believe he was offending for years beforehand.

His thesis, entitled Sexuality and everyday transnationalism among South Asian gay and bisexual men in Manchester, was submitted in August 2016 and was assessed as a "fail", but he was permitted to amend and resubmit it.

Giving them a drugged drink, believed to have been spiked with GHB, Sinaga would then assault the victims while they were unconscious and video the attack with a mobile phone.

"[13] In June 2017, his last victim, an 18-year-old amateur rugby union player, regained consciousness during the rape, fought off his attacker, and reported the incident to the police.

[8] Subsequent examination of Sinaga's iPhone by the police led to the discovery of more than 3 terabytes of digital video evidence of his assaults and rapes.

[5] Sinaga pleaded 'not guilty' to all charges made against him, resulting in his victims having to endure relating evidence in court, as well as the videos being shown to the jurors and others present at the trials.

[20][21] The presiding judge, Suzanne Goddard, remarked during the sentencing of the second trial that "It is almost beyond belief that someone who could profess some Christian faith could at the same time have been committing such wicked and evil crimes.

[25][26] While a whole life order has never been imposed for crimes other than murder, Judge Suzanne Goddard QC considered this option when sentencing Sinaga and said that he should never be released.

In her summing up, Judge Goddard commented: "In my judgment, you are a highly dangerous, cunning, and deceitful individual who will never be safe to be released, but that is a matter for the Parole Board.

Duncan Craig, founder of Survivors Manchester, the charity supporting several of Sinaga’s victims, stated that it had started a national conversation regarding men opening up about sexual abuse.

[23] After Sinaga's conviction, the mayor of his hometown of Depok, Mohammad Idris, announced that he planned to order raids on the local LGBT community.

[30][31] The announcement was swiftly condemned by human rights activists saying that conservatives in Indonesia were using Sinaga as an excuse to target the gay community in the country.