- Hair of the dog that bit you
- Hairy eyeball
- Halcyon days
- Half a loaf is better than no bread
- Half-cocked
- Half-hearted
- Half inch
- Hand over fist
- Handbags at ten paces
- Handle with kid gloves
- Hands down
- Hanged, drawn and quartered
- Hanky-panky
- Happy as a clam
- Happy as a sandboy
- Happy as Larry
- Happy clappy
- Happy slapping
- Happily ever after
- Harbinger of doom
- Hard and fast
- Hard cases make bad law
- Hard cheese
- Hard hearted
- Hard lines
- Hard man is good to find
- Hark, hark! the lark at heaven's gate sings
- Harp on
- Harum-scarum
- Harvest moon
- Has the cat got your tongue?
- Hasta la vista, baby
- Haste makes waste
- Hat trick
- Have a Captain Cook
- Have a dekko
- Have an axe to grind
- Have an inkling
- Have no truck with
- Haven't got a clue
- Have your guts for garters
- Have your work cut out
- He who can, does; he who cannot, teaches
- He who sups with the devil should have a long spoon
- He who laughs last laughs longest
- He will give the Devil his due
- Head over heels
- Heads up
- Heads will roll
- Hear hear
- Heard it through the grapevine
- Heart's content
- Heavens to Betsy
- Heavens to Murgatroyd
- Heavy metal
- Heebie-jeebies
- Hedge your bets
- Hell in a handbasket
- Hell has no fury like a woman scorned
- Hell or high water
- Hell's bells
- Hell's half acre
- Helter-skelter
- Hem and haw
- Here lies one whose name is writ in water
- Het up
- Hey presto
- Heywood, John
- Hiding to nothing
- Higgledy-piggledy
- High and dry
- High and mighty
- High as a kite
- High five
- High-flyer
- High horse
- High jinks
- High on the hog
- High time
- High, wide and handsome
- Hissy fit
- History is bunk
- Hit for six
- Hit the ground running
- Hit the hay
- Hit the nail on the head
- Hither and yon
- Hob-nob
- Hobson's choice
- Hobby-horse
- Hocus pocus
- Hodge-podge
- Hoi polloi
- Hoist with your own petard
- Hoity-toity
- Hold a candle to
- Hold with the hare and run with the hounds
- Hold your horses
- Home and dry
- Home and hosed
- Home is where the heart is
- Homonyms
- Honesty is the best policy
- Honey catches more flies than vinegar
- Hoochie-coochie
- Hooray Henry
- Horse, a horse, my kingdom for a horse
- Horse and cart
- Horse feathers
- Horse-sense
- Horse's mouth
- Hostage to fortune
- Hot-blooded
- Hot off the press
- Hot on the heels
- House divided against itself cannot stand
- Household words
- Houston, we have a problem
- How are the mighty fallen?
- How do you do?
- How now brown cow?
- How sharper than a serpent's tooth it is to have a thankless child
- Hugger-mugger
- Hung, drawn and quartered
- Hunky-dory
- Hunt and peck
- Hurly-burly
- Hush puppies