The continuous demand of groundwater for irrigation in the agricultural sector has shown remarkable development of groundwater resources in Haryana. Small farmers with limited resources cannot install deep tube wells and therefore have to buy groundwater from large farmers for irrigation. These groundwater irrigation markets have emerged as robust and leading irrigation institutions. Their prevalence supports about 15% of the total irrigated area. Amongst the different size of land ownership, the small farmers irrigate nearly 44% of their cultivated land with purchased water from the neighboring large farmers. The cropping intensity achieved by groundwater buyers is far higher than the sellers. However, on an average each seller supports 1.6 buyers, 6.1 ha of land and 34% of the buyer’s land. Generally, the sellers exploit groundwater buyers in groundwater transactions. The sellers follow the principle of profit maximization and do not negotiate with buyers on groundwater irrigation markets norms. The major objective of this study is to highlight the patterns and practices of groundwater irrigation markets in Haryana.