Battle of Tomaszów Mazowiecki

{{More citations needed|date=February 2024}}{{Infobox military conflict

| conflict = Battle of Tomaszów Mazowiecki

| partof = Invasion of Poland

| date = 6 September 1939

| place = Near Tomaszów Mazowiecki, Łódź Voivodeship, Poland

| result = German victory

| combatant1 = {{flagcountry|Nazi Germany}}

| combatant2 = {{flagcountry|Second Polish Republic}}

| commander1 = {{flagicon|Nazi Germany}} Erich Hoepner

| commander2 = {{flagicon|Second Polish Republic}} Władysław Kaliński

| strength1 = Two Panzer Divisions of the XVI Panzer Corps

| strength2 = 13th Infantry Division

| casualties1 = 100 killed
21 tanks destroyed

| casualties2 = 770 killed
1023 wounded

| campaignbox = {{Campaignbox Polish September Campaign}}

}}

The battle of Tomaszów Mazowiecki ({{langx|pl|Bitwa pod Tomaszowem Mazowieckim}}) was fought on 6 September 1939 near the town of Tomaszów Mazowiecki, Second Polish Republic, during the invasion of Poland.

The area was defended by Polish 13th Infantry Division under Col. Władysław Kaliński, and Germany's assault was carried by two armored divisions of the 16th Panzer Corps.{{Cite web |last= |first= |title=6 września 1939 (środa) |url=https://polskiemiesiace.ipn.gov.pl/mie/wszystkie-wydarzenia/wrzesien-1939/kalendarium/poczatek-ii-wojny-swiat/118430,6-wrzesnia-1939-sroda.html |access-date=2024-02-27 |website=Institute of National Remembrance Commission for the Prosecution of Crimes against the Polish Nation (Instytut Pamięci Narodowej Komisja Ścigania Zbrodni przeciwko Narodowi Polskiemu) |language=pl}} After the day-long battle, German forces broke through the Polish defences and took the town. The Polish 13th Division sustained heavy losses and was forced to retreat towards Warsaw.