Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Happy

Happy as a big sunflower.
—Anonymous

Happy as a boy at a baseball game.
—Anonymous

Happy as a June bug.
—Anonymous

Happy as a prince.
—Anonymous

Happy as a pussy that sees cream.
—Anonymous

Happy as a queen.
—Anonymous

Happy as a turtle dove.
—Anonymous

Happy as a wave that dances on the sea.
—Anonymous

Happy as the sunlight.
—Thomas Ashe

Happy as Heaven.
—Philip James Bailey

Happy as a reprieved thief.
—Honoré de Balzac

Happy as a clam at high water.
—J. R. Bartlett’s Dictionary of Americanisms

Happy az a dinner-bell.
—Josh Billings

Happy as a May-pole.
—R. D. Blackmore

Happy as birds in the spring.
—William Blake

Happy as a lark.
—Anne Brontë

Happy as the kine in the fields.
—Edward Bulwer-Lytton

Happy as birds that sing on a tree.
—Sir James Carnegie

Happy as a fish in water.
—Victor Cherbuliez

Happy as Spirits cleansed.
—Aubrey De Vere

Happy as ol’ maids an’ died on-married.
—Finley Peter Dunne

Happy as a king.
—John Gay

Happy as the blest above.
—George Granville

Happy as a Sunday in Paris, full of song, and dance, and laughter.
—Fitz-Greene Halleck

Happy as the Day.
—Josiah Gilbert Holland

Happy as a lord.
—Victor Hugo

Happy as the Bird whose nest
Is heaven’d in the heart of purple Hills.
—Gerald Massey

Happy as a miner when he has discovered a vein of precious metal.
—Guy de Maupassant

Happy as a schoolgirl going home for the holidays.
—Guy de Maupassant

Happy as a priest at a wedding.
—George Moore

Happy as an enfranchised bird.
—Thomas Moore

Happy as a poor man with a bag of gold.
—Dinah Maria Mulock

Happy as a pig in muck.
—G. F. Northall (Folk Phrases)

Happy as a young lamb.
—Ouida

Happy as heroes after battles won.
—Matthew Prior

As happy as the day is lang.
—Scottish Proverb

Happy as the fairest of all.
—William Shakespeare

As happy as a serf who leaves the king ennobled.
—Alexander Smith

Happy as a rose-tree in sunshine.
—William Makepeace Thackeray

Happy as a child.
—William Wordsworth

Happy as a Lover.
—William Wordsworth

As happy as birds in their bowers.
—William Wordsworth

Happy as a wave.
—William Wordsworth