Constance is a coast guard ship who takes almost everything seriously.
Whenever her name is mentioned, she is noted as an important ship. The tugs used to think that Constance was mean and unfriendly, and Constance used to think that she was too busy to be nice or friendly, but that all changed when Emily soon showed her how easy it was to be friendly, and became Constance's best friend. Even though Constance is very serious about her work, she can also be a lot of fun (like when she played light tag with Theodore and Hank). The tugs are now more comfortable socializing with Constance, but still give her all their respect.
Constance is loosely based on the CCGS Henry Larsen.
- Season 2 - Emily and the Rocket and Foduck Stays Home (mentioned)
- Season 3 - Hank's Hiccups (cameo), Hank's New Name (cameo), George and the Underwater Mystery (cameo), Grumpy Garbage Barge, Theodore and the Bully (cameo), A Joke Too Far, Scally's Stuff (cameo), Big Harbor Birthday (cameo), Emily and the Tug-Of-War, and Theodore and the Bully (cameo)
- Season 4 - George's Funny Noise (cameo), Guysborough's Garbage (cameo), Sigrid and the Bumpers (cameo), Hank's Wheezy Whistle (cameo), Theodore Tells A Lie, and Nautilus and the Sinking Ship (cameo)
- Season 5 - Hank Hurts a Ship, George's Big Hurry (cameo), George and the Flags (cameo), Hank Stays Up Late,Theodore the Tattletug, Brunswick's Big Scare, Bedford's Big Move, Pugwash is Gone! (cameo), Theodore's Bright Night, George Waits His Turn, Hank Floats Forward (cameo), and Theodore's Big Decision
- Constance's model was previously used for The Flat Eyed Coast Guard Ship.
- Her insignia is the maple leaf of Canada.
- She shares her horn sound with Rebecca.
- In the Finnish version, Constance is called Constans.
- Although she is a coast guard ship, her basis is an icebreaker.
- ERTL model (discontinued)