| Merck toch hoe sterck | |
| English Title: | Notice how strong |
| Prefix: | City |
| Country: | Bergen op Zoom |
| Author: | Adriaen Valerius |
| Lyrics Date: | 1622-25 |
| Composer: | English lute song |
| Music Date: | 1606 |
| Sound: | Merck-toch-hoe-sterck- fragment.ogg |
| Sound Title: | Merck toch hoe sterck |
"Merck toch hoe sterck" ("Notice how strong") is a Dutch war song and sea shanty written between 1622 and 1625 by Adriaen Valerius (who adapted the "Wilhelmus", the national anthem of the Netherlands). The music is based on an Elizabethan lute song written by Thomas Campion and John Dowland in 1606 (What if a Day or a Month).[1] [2] It was adopted as the anthem for Bergen op Zoom.