The Secretary General of the Confederación Nacional del Trabajo is the head of the Confederación Nacional del Trabajo (National Confederation of Labor; CNT), a Spanish confederation of anarcho-syndicalist labor unions. The position is elected by a congress or plenary session of the confederation. The position's powers are limited to technical and administrative affairs.

Since the confederation does not have fixed headquarters, the elected Secretary General's local federation becomes the confederation's central operations and a local plenary session of the local federation chooses the secretariats for other leadership positions. Together they are known as the Secretariado Permanente del Comité Confederal (Permanent Secretariat of the Confederal Committee, or SPCC). They, together with other regional federation's secretaries general, form the full Confederal Committee. The first general secretary of the CNT, chosen at its 1910 constitutional congress, was José Negre. He had been secretary general of Solidaridad Obrera, a Catalan union and precursor to the CNT. Thus Barcelona was the first headquarters.

The CNT operated clandestinely during years of repression and splintered. Sources support several timelines of CNT Secretaries General during this time.

Unless specified otherwise, the Headquarters of the CNT's Secretary General and National Committee during this period were based in Barcelona.^[1]

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No.	Portrait	Name (Birth–Death)	Term of office		Notes
1		Josep Negre[1] (1875–1939)	November 1910[1]	September 1911
			September 1911	1914[1]	During this period, the CNT was banned by the government and organised clandestinely.[1]
2		Manuel Andreu[2] (1889–1968)	November 1915[2]	August 1916[2]	Legal restrictions against the CNT were lifted and it resumed public activity in 1915.[3]
3		Francisco Jordán[1] (1886–1921)	August 1916[1]	February 1917 ‡[1]
4		Francisco Miranda[1] (1869–1950)	March 1917	August 1917 ‡[1]
–		Manuel Buenacasa[1] (1886–1964)	August 1917[1]	November 1917[1]	Interim Secretary General, while Francisco Miranda was imprisoned.[1]
(4)		Francisco Miranda (1869–1950)	December 1917	July 1918
5		Manuel Buenacasa[1] (1886–1964)	August 1918	December 1918[1]
6		Evelio Boal[1] (1884–1921)	January 1919	December 1919	As Provisional Secretary General.
			December 1919	March 1921 ‡[1]	Killed in June 1921.
7		Andreu Nin[1] (1892–1937)	March 1921	May 1921[1]
8		Joaquim Maurín[1] (1896–1950)	August 1921	February 1922 ‡[1]
9		Joan Peiró[1] (1887–1942)	May 1922	December 1922
10		Salvador Seguí (1887–1923)	December 1922	10 March 1923 †	Assassinated by pistoleros.
11		Manuel Adame (1901–1945)	July 1923	16 August 1923 ‡
12		Paulino Díez[1] (1892–1980)	August 1923	25 December 1923 ‡	Headquarted in Seville.[1]
13		José Gracian Galán[1]	April 1924	June 1924 ‡[1]	Headquarted in Zaragoza.[1]
–		Unknown[1]	June 1924[1]	September 1925[1]	During this period, the CNT was outlawed by the Dictatorship of Primo de Rivera and carried out its activities clandestinely.[4] The identity of the secretary general at this time is unknown.[1]
14		Avelino González[1] (1894–1938)	September 1925[1]	June 1926[1]	Headquarted in Gijón.[1]
15		Segundo Blanco[1] (1899–1957)	July 1926	November 1926[1]	Headquarted in Gijón.[1]
16 (9)		Joan Peiró[1] (1887–1942)	January 1927	May 1929[1]
17		Ángel Pestaña[1] (1886–1937)	June 1929[1]	June 1930
18		Progreso Alfarache[1] (1888–1964)	27 June 1930	27 September 1930 ‡
19		Francesc Arín[1]	October 1930	December 1930	Serving as Interim Secretary General.[1]
			December 1930	December 1931	The Second Spanish Republic was established during this period.
20 (17)		Ángel Pestaña[1] (1886–1937)	December 1931	March 1932[1]
21		Manuel Rivas [ca][1]	19 March 1932	January 1933 ‡
22		Miguel Yoldi[1] (1903–1961)	December 1933	February 1935
23		Horacio Prieto[1] (1902–1985)	March 1935	18 July 1936	Headquarted in Zaragoza. Provisionally replaced following the outbreak of the Spanish Civil War.[1]
–		David Antona [es][1] (1904–1945)	18 July 1936	September 1936[1]	Provisional Secretary General during the early months of the Spanish Civil War.[1]
(23)		Horacio Prieto[1] (1902–1985)	September 1936[1]	November 1936
24		Mariano Vázquez[5] (1909–1939)	November 1936[5]	February 1939[1]	Headquarters transferred from Barcelona, to Madrid and then Valencia.[5] Term ended by the conclusion of the Catalonia Offensive.[1] Died in Paris in June 1939.[6]

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During this period, the CNT worked clandestinely both inside Spain and in French exile. A schism among the exiles created two confederal committees with their own corresponding secretaries general.