Tomaszów Lubelski [tɔˈmaʂuf luˈbɛlskʲi] is a town in south-eastern Poland with 19,365 inhabitants (2017). Situated in the Lublin Voivodeship, near Roztocze National Park, it is the capital of Tomaszów Lubelski County.

The town was founded at the end of the 16th century by Jan Zamoyski as Jelitowo. It is known by its current name since 1613 when it was renamed after Zamoyski's son, Tomasz. It obtained its city charter in 1621. It was administratively located in the Bełz Voivodeship in the Lesser Poland Province of Poland. The area around the city saw serious fighting in 1914 during World War I.

On September 17–26, 1939, during the joint German-Soviet invasion of Poland which started World War II, the Battle of Tomaszów Lubelski was fought between Poland and Germany. The town was bombed by the Germans and eventually found itself under German occupation. The town's Jewish community, which numbered over 5,600 in 1939 at the start of the war, was persecuted by the occupiers in the Holocaust. The Nazi Germans first placed the Jews in a ghetto established in the town, then exterminated them in 1942 at Bełżec extermination camp located a few km. south of the town. The Jewish community ceased to exist.

In 1975–1998, the town was administratively located in the Zamość Voivodeship.

In the town there are two faculties of Catholic University of Lublin (Legal and Economic Sciences). It has two high schools (Bartosz Głowacki High School and Władysław Sikorski High School), three technical colleges, two gymnasiums and two primary schools.

International Folk Festival Roztocze is a popular annual music festival organized since 1990. Since 2008 the town council organizes reconstructions of Battle of Tomaszów.

Tomaszów is the home for the football team Tomasovia.

There are two main newspapers published weekly in Tomaszów Lubelski. First of them, ReWizje Tomaszowskie, is financed by the town council. Second of them, Tygodnik Tomaszowski, belongs to a private company.

Tomaszów Lubelski is twinned with:

• Grigiškės, Lithuania
• Kivertsi, Ukraine
• Zhovkva, Ukraine

• Mordechai Yosef Leiner (1801–1854), Hasidic thinker
• Menachem Mendel of Kotzk, (1787–1859), Hasidic thinker
• Joanna Pacuła (born 1957), actress
• Leon Pinsker (1821–1891), Zionist activist
• Zygmunt Sochan (1909–1998), footballer and member of the Polish resistance movement in World War II
• Monika Skinder (born 2001), cross-country skier
• Marek Zub (born 1964), football manager
• Wojciech Żukowski (born 1964), member of the parliament, Law and Justice

• Tomaszów County website
• Old pictures of Tomaszów
• Tomaszów virtual tour

• Catholic University of Lublin Official website