The 4th Secretariat of the Workers' Party of Korea (WPK) (Korean: 4차 조선로동당 비서국), officially the Secretariat of the 4th Congress of the Workers' Party of Korea, was elected by the 14th Plenary Session of the 4th Central Committee on 12 October 1966.
| Rank | Name | Hangul | CH&VI | 5th SEC | Left office | Duration | Positions | ||
|---|---|---|---|---|---|---|---|---|---|
| 1 | Kim Il Sung | 김일성 | Old | Reelected | 13 November 1970 | General Secretary of the WPK Central Committee | |||
| 2 | Choe Yong-gon | 최용건 | Old | Reelected | 13 November 1970 | ||||
| 3 | Kim Il | 김일 | Old | Reelected | 13 November 1970 | ||||
| 4 | Pak Kum-chol | 박금철 | Old | Purged | 8 May 1967 | ||||
| 5 | Yi Hyo-sun | 이효선 | Old | Purged | 8 May 1967 | ||||
| 6 | Kim Kwang-hyop | 김광협 | New | Purged | July 1970 | ||||
| 7 | Sok San | 속산 | New | Reelected | 13 November 1970 | ||||
| 8 | Ho Pong-hak | 허봉학 | New | Purged | 30 June 1969 | ||||
| 9 | Kim Yong-ju | 김영주 | New | Reelected | 13 November 1970 | ||||
| 10 | Pak Yong-guk | 박용국 | New | Purged | 8 May 1967 | ||||
| 11 | Kim To-man | 金道満 | New | Purged | 8 May 1967 | ||||
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| Name | Hangul | 5th SEC | Took office | Left office | Duration | Positions | |
|---|---|---|---|---|---|---|---|
| Yi Kuk-chin | 이국진 | Demoted | 30 June 1969 | 13 November 1970 | |||
| Kim Chung-nin | 김중린 | Reelected | 30 June 1969 | 13 November 1970 | |||
| Yang Hyon-sop | 양형섭 | Reelected | 30 June 1969 | 13 November 1970 |
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