| H&H | Half and Half 
| Others |
| H&H | Handel and Haydn
| Others |
| H&H | Handel and Haydn Society
| Others |
| H&H | Hemoglobin and Hematocrit
| Others |
| H&H | Hemoglobolin and Hematocrit
| Others |
| H&H | Highways and Horizons
| Others |
| H/H | Hell or Heaven
| Others |
| H/H | Hematocrit and Hemoglobin
| Others |
| H/H | Hemoglobin/ Hematocrit
| Others |
| H/H | Henderson-Hasselbach equation
| Others |
| H/H | Hospital/Homebound
| Others |
| H/H | Hotel to Home
| Others |
| H/H | House to House
| Others |
| HH | C++ header file
| Others |
| HH | H. H. Smith
| Others |
| HH | Ha Ha
| Others |
| HH | Haha
| Others |
| HH | Hail Hitler
| Others |
| HH | Half Height
| Others |
| HH | Hand Hammered
| Others |
| HH | Hand Held
| Others |
| HH | Hand helped
| Others |
| HH | Handlin and Hefferan, Florida Attorneys
| Others |
| HH | Hands High
| Others |
| HH | Handsome Hunk
| Others |
| HH | Handy Hands
| Others |
| HH | Handy Husband
| Others |
| HH | Hanse Hamburg
| Others |
| HH | Hanseatic Hamburg
| Others |
| HH | Hansestadt Hamburg
| Others |
| HH | Happy Halloween
| Others |
| HH | Happy Hana
| Others |
| HH | Happy Hannukah
| Others |
| HH | Happy Happy
| Others |
| HH | Happy Harvester
| Others |
| HH | Happy Home
| Others |
| HH | Happy Hour
| Others |
| HH | Happy Humper
| Others |
| HH | Harald Halberg
| Others |
| HH | Hard House
| Others |
| HH | Hard of Hearing
| Others |
| HH | Hardenbergh Hall
| Others |
| HH | Hardy Heller
| Others |
| HH | Harefield Hospital
| Others |
| HH | Harvard Hottie
| Others |
| HH | Has Herpes
| Others |
| HH | Hating Hoe
| Others |
| HH | Haven House
| Others |
| HH | Hawthorne Heights
| Others |
| HH | Hayes-Healy Residence Hall
| Others |
| HH | Head Heavy
| Others |
| HH | Head Hunter
| Others |
| HH | Head to Head
| Others |
| HH | Hearing Handicapped
| Others |
| HH | Heart and Hustle
| Others |
| HH | Heart Healthy
| Others |
| HH | Heaven and Hell
| Others |
| HH | Heavy Hand
| Others |
| HH | Heavy Hole
| Others |
| HH | Hector Hugh
| Others |
| HH | Heifer Herder
| Others |
| HH | Hell Highway
| Others |
| HH | Helly Hansen, clothiers
| Others |
| HH | Henry Hebbard
| Others |
| HH | Hentai Heaven
| Others |
| HH | Herbert Hoover, United States President
| Others |
| HH | Herbie Hancock
| Others |
| HH | Hereditary Haemochromatosis
| Others |
| HH | Hereditary Hemochromatosis
| Others |
| HH | Herold Helzer
| Others |
| HH | Hi Hat
| Others |
| HH | Hiatus Hernia
| Others |
| HH | Hidden Hatchet
| Others |
| HH | High and Horny
| Others |
| HH | High Heat
| Others |
| HH | High Heels
| Others |
| HH | High Honors
| Others |
| HH | High Humidity
| Others |
| HH | Highland Heather
| Others |
| HH | Highland Hospital, Rochester, New York
| Others |
| HH | Highly Hospitable
| Others |
| HH | Hilton Head
| Others |
| HH | Hip Hop
| Others |
| HH | Hippity Hop
| Others |
| HH | His Her
| Others |
| HH | His Highness
| Others |
| HH | Hit Head
| Others |
| HH | Hochschild Homology
| Others |
| HH | Hogan's Heroes
| Others |
| HH | Holcomb Hathaway, publishers
| Others |
| HH | Holding Hands
| Others |
| HH | Hollow Handle
| Others |
| HH | Holly Hobby
| Others |
| HH | Hollywood Hijinx
| Others |
| HH | Hollywood Hogan, wrestler
| Others |
| HH | Holt Handbook
| Others |
| HH | Home Health
| Others |
| HH | Homework Help
| Others |
| HH | Homing Pattern
| Others |
| HH | Horizontally Homogeneous
| Others |
| HH | Horrifying Halloween
| Others |
| HH | Hotel Healdsburg
| Others |
| HH | hour HH
| Others |
| HH | HouseHold
| Others |
| HH | Household How
| Others |
| HH | households
| Others |
| HH | Howard Hunt
| Others |
| HH | Hubert Humphrey
| Others |
| HH | Huddy's Hauler
| Others |
| HH | Huge Help
| Others |
| HH | Human Humanoid
| Others |
| HH | Humble Hans
| Others |
| HH | Humongous Head
| Others |
| HH | Hydrolysis House
| Others |
| HH | Hydrostatic Head
| Others |
| HH | Hyman Hall
| Others |
| HH | Hyperglycemia And Hyperismolar
| Others |
| HH | Hypnogogic Hallucinations
| Others |