USS Alert

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Five ships of the United States Navy have borne the name Alert. During World War I, three ships held the name simultaneously.

• USS Alert (1812), was an 18-gun sloop-of-war captured from the United Kingdom in the War of 1812 that was sold in 1829 for breaking up.
• {{USS|Alert|1861}}, was a screw tug used during the Civil War.
• {{USS|Alert|AS-4}}, was a screw steamer in use during the late 19th century and World War I.
• {{USS|Alert|1896}}, was a steam launch acquired from the Coast Guard during World War I.
• {{USS|Alert|SP-511}}, was used as a patrol boat during World War I.

Seven cutters of the United States Coast Guard have borne the name Alert.

• {{USRC|Alert|1818}} A schooner homeported at Eastport, Maine. 75 ton displacement.Canney, p 11
• {{USRC|Alert|1829}} A schooner built to replace built to replace Alert (1818). 120 ton displacement.Canney, p 13
• {{USRC|Alert|1877}} A centerboard sloop used for life saving duty at Tom's River, New Jersey. 10 ton displacement.Canney, p 45
• {{USRC|Alert|1901}} A steam launch originally homeported at Mobile, Alabama. 19 ton displacement.Canney, p 59
• {{USRC|Alert|1907}} A steam harbor tug replacing Alert (1901) at Mobile, Alabama. 35 ton displacement.Canney, p 62
• {{USCGC|Alert|WMEC-127}} An Active-class cutter, commissioned as WSC-127, homeported at various stations in California.Canney, p 98Scheina, p 57
• {{USCGC|Alert|WMEC-630}}, a Reliance-class cutter.Scheina, p 40