Introduction: Samrómur Children Icelandic Speech 1.0 was developed by the Language and Voice Lab, Reykjavik University in cooperation with Almannarómur, Center for Language Technology. The corpus contains 131 hours of Icelandic prompted speech from 3,175 speakers (children, aged 4-17 years) representing 137,597 utterances. This version 1.0 is equivalent to "Samrómur Children Icelandic Speech 21.09" as used by the Language Technology Programme for Icelandic 2019-2023. Data: Speech data was collected between October 2019 and September 2021 using the Samrómur website which displayed prompts to participants. The prompts were mainly from The Icelandic Gigaword Corpus, which includes text from novels, news, plays, and from a list of location names in Iceland. Additional prompts were taken from the Icelandic Web of Science and others were created by combining a name followed by a question or a demand. Prompts and speaker metadata are included in the corpus. The audio data is divided into train, dev, and test sets and is presented as flac compressed, single channel, 16 kHz, 16-bit linear PCM. Samples: Please view this audio sample (FLAC). Updates: Additional information, updates, bug fixes may be available in the LDC catalog entry for this corpus at LDC2022S11.