| Acronym | Meaning |
| HAGD | Have A Good Day |
| HAGE | Have A Good Evening |
| HAGL | Have A Good Life |
| HAGN | Have A Good Night |
| HAGO | Have A Good One |
| HAGS | Have A Great Summer |
| HAGT | Have A Great Time |
| HAISTK | How Am I Supposed To Know? |
| HAND | Have A Nice Day |
| HAWT | Hot Having A Wonderful Time |
| HAY | How Are You |
| HAYD | How Are You Doing? |
| HAYT | How Are You Today? |
| HBD | Happy Birthday |
| HBK | Heart Break Kid |
| HBN | How About Now |
| HBO | Home Box Office |
| HBP | Half-Blood Prince (Harry Potter) |
| HBT | How ‘Bout That |
| HBTU | Happy Birthday To You |
| HBTY | Happy Birthday To You |
| HBY | How About You? |
| HC | Holy Cow |
| HCDAJFU | He Could Do A Job For Us |
| HCIT | How Cool Is That? |
| HD | High-Definition |
| HDD | Hard Disk Drive |
| HDMI | High Definition Multimedia Interface |
| HDTH | How Did That Happen? |
| HDTV | High Definition Television |
| HDY | How Dare You |
| HDYD | How Do You Do? |
| HDYDT | How Did You Do That? |
| HDYK | How Do/Did You Know? |
| HE | Happy Ending High Explosives |
| HEA | Happily Ever After |
| HENRY | High Earner, Not Rich Yet |
| HF | Have Fun |
| HFFA | Hot From Far Away |
| HFGL | Have Fun, Good Luck |
| HFY | Here For You Happy for You |
| HG | Holy Grail |
| HGH | Haters Gonna Hate |
| HGI | How Goes It? |
| HGL | Happy Go Lucky |
| HGTV | Home and Garden Television |
| HGV | Heavy Goods Vehicle |
| HH | Holding Hands |
| HHIS | Hanging Head In Shame |
| HHOJ | Ha-Ha, Only Joking |
| HHOK | Ha-Ha, Only Kidding |
| HHVF | Ha-Ha, Very Funny |
| HHWW | Holding Hands While Walking |
| HIG | How’s It Going? |
| HIIK | Hell If I Know |
| HIMYM | How I Met Your Mother (TV show) |
| HIV | Human Immunodeficiency Virus |
| HIWTH | Hate It When That Happens |
| HJNTIY | He’s Just Not That Into You |
| HK | Hong Kong Hostile Kids |
| HL | Half Life (game) |
| HLAS | Hook, Line And Sinker |
| HMB | Hit Me Back (reply) |
| HMI | Human Machine Interface |
| HMIHY | How May I Help You? |
| HML | Hate My Life |
| HMP | Help Me, Please |
| HMS | Her Majesty’s Ship (UK) |
| HMU | Hit Me Up |
| HMUL | Hit Me Up Later |
| HMV | His Master’s Voice |
| HNG | Horny Net Geek |
| HNOS | Home Network Operating System |
| HNR | Hit ‘N’ Run |
| HNY | Happy New Year |
| HO | Hold On Head Office |
| HOA | Home Owners Association |
| HOAS | Hold On A Second |
| HOAY | How Old Are You? |
| HOF | Hall Of Fame Heavy on Flag |
| HOG | Harley Owner Group |
| HOH | Head Over Heels Hard Of Hearing |
| HOLLAND | Hope Our Love Lasts And Never Dies |
| HOV | High Occupancy Vehicle |
| HOWDY | How Do You Do? |
| HP | Harry Potter |
| HQ | High Quality |
| HR | Human Resources |
| HRC | Human Rights Campaign |
| HRH | His/Her Royal Highness |
| HSBC | Hong Kong and Shanghai Banking Corporation |
| HSH | Home Sweet Home |
| HSIK | How Should I Know? |
| HSIT | How Sad Is That |
| HSL | Hue, Saturation, Lightness |
| HSM | High School Musical |
| HSP | Highly Sensitive Person |
| HSPDA | High Speed Packet Data Access |
| HST | High Speed Train |
| HSV2 | Herpes Simplex Virus 2 |
| HT | Hat Tip (Thanks) Home Time Handheld Transceiver |
| HTBT | Had To Be There |
| HTC | Hit The Cell |
| HTE | Hard To Explain |
| HTG | Hard To Get |
| HTH | Hope That Helps How The Hell |
| HTHFYS | Hope To Hear From You Soon |
| HTM | Hand To Mouth |
| HTML | Hypertext Markup Language |
| HTSYS | Hope To See You Soon |
| HTTP | Hyper-Text Transfer Protocol |
| HTTPS | Hyper-Text Transfer Protocol Secure |
| HTTR | Hail To The Redskins |
| HU | Hollywood Undead (Band) |
| HUA | Heard Understood Acknowledged |
| HVAC | Heating, Ventilating, Air Conditioning |
| HVD | Happy Valentine’s Day |
| HWB | Hottie With Body |
| HWGA | Here We Go Again |
| HWP | Height Weight Proportional |
| HWSNBN | He Who Shall Not Be Named |
| HWU | Hey, What’s Up? |
| HWYD | How Was Your Day? |
| HYB | How You Been? |
| HYD | How Ya Doing? |
| HYFB | Hope You Feel Better |
| HYG | Here You Go |
| HYH | Have You Heard Hold Your Horses |
| HYIP | High Yield Investment Program |
| HYP | Harvard, Yale, Princeton |
| HYS | Have Your Say |
| HYU | Hit You Up |