The two cops were found guilty in District Court of conspiring to divulge information on a 2014 murder investigation in exchange for HK$130,000.
Constable Lee Yuen-fook, 48, described in court as the mastermind, was sentenced to three years' imprisonment, while station sergeant Yip Kwok-leung, 51, was given 30 months.
Judge Eddie Yip Chor-man said Lee had to bear the harshest punishment as he coordinated the information leak.
The judge said although the information both policemen revealed did not undermine the murder investigation, the pair nevertheless breached their duties as law enforcers.
Businessman Hung Wai-ming, 47, was convicted of conspiracy to commit misconduct in public office and jailed for 27 months.
Judge Yip said even though Hung benefited most from the information, he will bear the smallest sanction.
On October 5, 2014, a man was attacked by a gang in Tsim Sha Tsui and died two days later.
Eight months after the slaying, Lee, with Yip's assistance, obtained confidential information about the investigation and divulged the details to Hung, so that he could pass it on to the suspects in the case. The trio were promised a reward of HK$600,000, but received less than half of that amount.
The Independent Commission Against Corruption later received a complaint regarding Lee and Yip's breach of duty, and hid small audio recorders in Lee and Hung's cars, where most of their conversations occurred.
The recordings also captured Lee and Hung talking about how the reward money should be split among the three.
The court heard that in exchange for the confidential information, Lee, Yip and Hung got HK$110,000, HK$20,000 and HK$130,000, respectively, far short of the promised total.