Mustla may refer to several places in Estonia:

• Mustla, small borough in Tarvastu Parish, Viljandi County
• Mustla, Järva County, village in Paide Parish, Järva County
• Mustla, Pärnu County, village in Saarde Parish, Pärnu County
• Mustla, Laimjala Parish, village in Laimjala Parish, Saare County
• Mustla, Pihtla Parish, village in Pihtla Parish, Saare County

• SADS (band)
• Sad Semester
• Sadska
• Sadská
• Sad Song
• Sad Song (Oasis song)
• Sad Songs
• Sad Songs Are Nature's Onions
• Sad Songs for Dirty Lovers
• Sad Songs for Dirty Lovers (One Tree Hill episode)
• Sad Songs (Say So Much)
• Sad Statue
• Sad Statue (Song)
• Sad Sweet Dreamer
• Sadt
• Sad Tango
• SADTC
• S.A.D. Tissot
• Sad Town
• SADTU
• Sadu
• Sadu (Cibin)
• Sadu (Jiu)
• Sadullah Khan
• Sadullapur Upazila