Gambetta is a station of the Paris Métro. It serves Line 3 and is the southern terminus of Line 3bis. It was opened on 25 January 1905 when the line was extended from Père Lachaise and was the eastern terminus of the line until 27 November 1921, when the line was extended to Porte des Lilas. In 1969, the former Martin Nadaud station—which was only 232 metres west of Gambetta—was combined with Gambetta by linking Martin Nadaud's closed platforms with Gambetta by tunnel. On 23 March 1971 the line to Porte des Lilas was separated from line 3 and became Line 3bis. The beginning of the old tunnel to Porte des Lilas now connects the platforms of lines 3 and 3bis.