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| 1926, March 17 |
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| The admission of Germany to the League was postponed because of complications raised by Spain and Brazil regarding seats on the council. | 1 |
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| March 26 |
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| Romania and Poland concluded a treaty of alliance. | 2 |
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| June 10 |
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| Spain announced withdrawal from the League but later rescinded this decision. | 3 |
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| Aug. 7 |
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| Italy concluded a treaty of friendship with Spain. This was followed by similar treaties with Ethiopia (Aug. 2, 1928) and with Greece (Sept. 23, 1928). | 4 |
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| Aug. 17 |
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| Yugoslavia concluded a treaty with Greece, settling the question of the Yugoslav free zone at Saloniki. Yugoslavia gained more extensive privileges at Saloniki in a later treaty (March 17, 1929). This was followed by a treaty of friendship between the two nations on March 27, 1929. | 5 |
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| Sept. 8 |
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| Germany was admitted to the League and given a permanent seat on the council. | 6 |
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| Sept. 18 |
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| Yugoslavia and Poland concluded a treaty of friendship. | 7 |
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