Helmsdorf may refer to the following places in Germany:

• Helmsdorf, Thuringia, in the Eichsfeld district, Thuringia
• {{Interlanguage link multi|Helmsdorf (Gerbstedt)|de}}, a locality in Heiligenthal, in Mansfeld-Südharz district, Sachsen-Anhalt
• A locality in Stolpen, in the Sächsische Schweiz district, Saxony
• A locality in Geisenhausen, in Landshut district, Bavaria

• Long Arm of the Law (disambiguation)
• Long Arm of the Law (film)
• Longarm quilting
• Longarm Quilting
• Long Arrow
• Longarus
• Longarus of the Dardani
• Longas
• Long Ashton Rural District
• Long As I Can See the Light
• Long as I Live
• Long as I'm Here with You
• Long assize
• Longas, Spain
• Longastatin
• Longas, Zaragoza
• Longaulnay
• Longavesnes
• Longavi, Chile
• Longavi (disambiguation)
• Longavi river
• Longavi River
• Long axis
• Long ball
• Long Ball