The 120 members of the third Knesset were elected on 26 July 1955. The breakdown by party was as follows:
| MK | Replaced | Party | Date | Notes |
|---|---|---|---|---|
| Yussuf Hamis | Yitzhak Yitzhaky | Mapam | 21 September 1955 | |
| Ya'akov Nitzani | Ya'akov Shimshon Shapira | Mapai | 14 November 1955 | |
| Jabr Muadi | Seif el-Din el-Zubi | Democratic List for Israeli Arabs | 13 February 1956 | |
| Yizhar Smilansky | Aharon Becker | Mapai | 1 October 1956 | |
| Yisrael Kargman | Zalman Shazar | Mapai | 8 October 1956 | |
| David Bar-Rav-Hai | Senetta Yoseftal | Mapai | 24 October 1956 | |
| Ya'akov Klivnov | Haim Ariav | General Zionists | 16 June 1957 | |
| Hannah Lamdan | Ehud Avriel | Mapai | 31 July 1957 | |
| Yohanan Cohen | Yeshayahu Forder | Progressive Party | 28 October 1957 | |
| Amos Degani | Aharon Remez | Mapai | 19 December 1957 | |
| Moshe Carmel | Yitzhak Tabenkin | Ahdut HaAvoda | 9 June 1958 | |
| Yerahmiel Assa | Avraham Abaas | Ahdut HaAvoda | 17 September 1958 | |
| Haim Zadok | Yosef Sprinzak | Mapai | 28 January 1959 | |
| Shlomo-Ya'akov Gross | Zalman Ben-Ya'akov | Religious Torah Front | 2 March 1959 | |
| Jenia Taversky | Shlomo Hillel | Mapai | 6 July 1959 |
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