Former Chief Whip Simon Hart and former Scottish Secretary Sir Alister Jack, who stepped down as MPs ahead of last summer's general election, are among those to get peerages.
Sir Alister served as Scottish secretary from 2019 until he stood down, later receiving a knighthood in Sunak's previous round of honours in July 2024.
During the election campaign, he was the most senior politician to be caught up in the row over government insiders gambling on the date of the poll.
The former MP for Dumfries and Galloway admitted placing three bets but has previously said he did not breach any rules and has not been investigated by the Gambling Commission.
Hart spent nearly two years as Sunak's chief whip, responsible for party discipline and ensuring MPs vote with the government.
The publication of his parliamentary diaries last month, which included stories of an MP being trapped in a brothel and politicians demanding knighthoods, caused a stir in Westminster and were criticised by some Tories for revealing the secrets of his time in government.
Also joining the House of Lords are former Transport Secretary Mark Harper, former Attorney General Victoria Prentis, former Conservative Party chief executive Stephen Massey and Eleanor Shawcross, who ran Sunak's policy unit in Downing Street.
Meanwhile, it was confirmed former Ofsted chief inspector Amanda Spielman has been given a peerage, after being nominated by Badenoch.