D'varim / Deuteronom 4:39 says loud and clear that there is no other G-d. Hashem is the only one.
"And you shall know this day and consider it in your heart, that the L-rd He is the G-d in heaven above, and upon the earth below; there is none else." D'varim / Deuteronomy 4:39.
The definite article הָֽ ('ha") in front of the word "elohim" (a title used to describe G-d, false gods, angels and even humans who are mighty / powerful judges) makes the translation "the G-d." הָֽאֱלֹ-הִ֔ים. Here is the Hebrew:
וְיָֽדַעְתָּ֣ הַיּ֗וֹם וַהֲשֵֽׁבֹתָ֘ אֶל־לְבָבֶ֒ךָ֒ כִּ֤י יְיָ֙ ה֣וּא הָֽאֱ-להִ֔ים בַּשָּׁמַ֣יִם מִמַּ֔עַל וְעַל־הָאָ֖רֶץ מִתָּ֑חַת אֵ֖ין עֽוֹד׃
Translations tend to translate this as "He is G-d", but the text acutally says "He is THE G-d." -- that is to say, "the One and Only G-D".
D'varim / Deuteronomy 4:35 (four verses earlier) is even more explicit....
אַתָּה֙ הָרְאֵ֣תָ לָדַ֔עַת כִּ֥י יְיָ֖ ה֣וּא הָֽאֱ-לֹהִ֑ים אֵ֥ין ע֖וֹד מִלְבַדּֽוֹ׃
"You have been shown these things so you should know that HaShem is the the One and Only G-D and there is no-one else apart from Him" (D'varim / Deuteronomy 4:35
Again we have The definite article הָֽ ('ha") in front of the word "elohim" ("the G-d"), but we also have אֵ֥ין ע֖וֹד מִלְבַדּֽוֹ׃ - no one else apart from Him.