The Second Aliyah (Hebrew: העלייה השנייה, HaAliyah HaShniya) was an aliyah (Jewish immigration to Palestine) that took place between 1904 and 1914, during which approximately 35,000 Jews immigrated into Ottoman-ruled Palestine, mostly from the Russian Empire, some from Yemen.

The Second Aliyah was a small part of the greater emigration of Jews from Eastern Europe which lasted from the 1870s until the 1920s. During this time, over two million Jews emigrated from Eastern Europe. The majority of these emigrants settled in the United States where there was the greatest economic opportunity. Others settled in South America, Australia, and South Africa and only a small fraction of Jews who migrated went to Palestine.

There are multiple reasons for this mass emigration from Eastern Europe and the most commonly talked about is the growing antisemitism in Russia and the Pale of Settlement. The manifestations of this antisemitism were various pogroms, notably the Kishinev pogrom and the pogroms that attended the 1905 Russian Revolution. The other major factor for emigration was economic hardship. The majority of the Jewish population of Eastern Europe was poor and they left in search of a better life. Jews left Eastern Europe in search of a better economic situation which the majority found in the United States.

Palestine on the other hand offered very limited economic incentives for new immigrants. Palestine was not a place for poor immigrants to come and better their economic situation because there was very little industry. Thus, the majority of the Jewish immigrants found a livelihood through working the land. Many of the European Jewish immigrants during the late 19th-early 20th century period gave up after a few months and went back to their country of origin, often suffering from hunger and disease. David Ben Gurion estimated that 90% of the Second Aliyah “despaired of the country and left”.