基因组学（英语：Genomics），或基因体学，是研究生物基因组和如何利用基因的一门学问。该学科提供基因组信息以及相关数据系统利用，试图解决生物，医学，和工业领域的重大问题。

基因组学能为一些疾病提供新的诊断，治疗方法。例如，对刚诊断为乳腺癌的女性，一个名为“Oncotype DX”的基因组测试，能用来评估病人乳腺癌复发的个体危险率以及化疗效果，这有助于医生获得更多的治疗信息并进行个性化医疗。基因组学还被用于食品与农业部门。

基因组学的主要工具和方法包括：生物信息学，遗传分析，基因表达测量和基因功能鉴定。

Genomics is a discipline in genetics that applies recombinant DNA, DNA sequencing methods, and bioinformatics to sequence, assemble, and analyze the function and structure of genomes (the complete set of DNA within a single cell of an organism). Advances in genomics have triggered a revolution in discovery-based research to understand even the most complex biological systems such as the brain. The field includes efforts to determine the entire DNA sequence of organisms and fine-scale genetic mapping. The field also includes studies of intragenomic phenomena such as heterosis, epistasis, pleiotropy and other interactions between loci and alleles within the genome. In contrast, the investigation of the roles and functions of single genes is a primary focus of molecular biology or genetics and is a common topic of modern medical and biological research. Research of single genes does not fall into the definition of genomics unless the aim of this genetic, pathway, and functional information analysis is to elucidate its effect on, place in, and response to the entire genomes networks.