Open trial may refer to:

• Public trial
• Open-label trial, a type of clinical trial that is not blinded

• Ad Lib
• Ad libbing
• Ad lib (disambiguation)
• Ad-lib Night
• Ad Lib (typeface)
• Adli El Shafei
• Adli El Shafei I
• Adli El Shafei II
• Adligenswil
• Adligenswil LU
• Adligenswil (Lucerne)
• Adligenswil, Switzerland
• Adlikon
• Adlikon b. Andelfingen
• Adlikon bei Andelfingen
• Adlikon bei Andelfingen, Switzerland
• Adlikon bei Andelfingen ZH
• Adlikon bei Andelfingen (Zurich)
• Adlikon bei Andelfingen (Zürich)
• Ad limina
• Ad Limina
• Ad limina apostolorum
• Ad Limina Apostolorum
• Ad limina visit
• Ad Limina visit