[ Company selection: All | | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z ] |
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 | Company | IECQ Certificate Number | | Country / location | Issue date | Status | |
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| Hans Brockstedt GmbH | IECQ-P VDE 18.0008 | | Germany | 2015/10/20 | Cancelled | |
| Harwin Plc | IECQ-P BSI 14.0017 | | United Kingdom | 2017/10/05 | Cancelled | |
| He Yuan ZhongGuangDian Communication Technology Co... | IECQ-P NQAGB 18.0002 | | China | 2018/04/04 | Cancelled | |
| Hefei Haier Air Conditioner Co., Ltd | IECQ-P SGSCN 25.0004 | | China | 2025/01/15 | Current | |
| Hefei Haier Air Conditioning Electronics Co., Ltd. | IECQ-P SGSCN 25.0003 | | China | 2025/01/15 | Current | |
| Hefei Haier Refrigerator Co., LTD. | IECQ-P SGSCN 25.0010 | | China | 2025/02/24 | Current | |
| Hefei Intelligent Mobility Optoelectronics Co., Lt... | IECQ-P SGSCN 25.0040 | | China | 2025/10/19 | Current | |
| Hefei Lianchuang Optics Co., Ltd. | IECQ-P SGSCN 24.0001 | | China | 2024/11/18 | Current | |
| Hefei SMAT Technology Co., Ltd. | IECQ-P SGSCN 25.0048 | | China | 2025/11/24 | Current | |
| Hemstedt GmbH | IECQ-P VDE 18.0007 | | Germany | 2012/03/28 | Cancelled | |
| HENGDIAN GROUP DMEGC MAGNETICS CO., LTD. | IECQ-P CEP 18.0002 | | China | 2018/03/12 | Cancelled | |
| Hezhou Jinglin Communication Technology Co., Ltd. | IECQ-P SGSCN 25.0030 | | China | 2025/09/04 | Current | |
| Hold Key Electric Wire and Cable Co., Ltd. | IECQ-P ULTW 14.0001 | | Taiwan | 2023/10/22 | Current | |
| Huahao Ark Technology Co., Ltd. | IECQ-P NQAGB 25.0004 | | China | 2025/09/24 | Current | |
| HUIZHOU FUKES ELECTRONIC TECHNOLOGY CO., LTD. | IECQ-P MOODY 25.0002 | | China | 2025/07/23 | Current | |
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