diff --git a/jiant/tasks/tasks.py b/jiant/tasks/tasks.py
index a4337df81..393065e6c 100644
--- a/jiant/tasks/tasks.py
+++ b/jiant/tasks/tasks.py
@@ -1097,6 +1097,101 @@ def load_data(self):
         log.info("\tFinished loading SNLI data.")
 
 
+@register_task("adversarial_nli_a1", rel_path="AdversarialNLI/", datasets=["R1"])
+@register_task("adversarial_nli_a2", rel_path="AdversarialNLI/", datasets=["R2"])
+@register_task("adversarial_nli_a3", rel_path="AdversarialNLI/", datasets=["R3"])
+@register_task("adversarial_nli", rel_path="AdversarialNLI/", datasets=["R1", "R2", "R3"])
+class AdversarialNLITask(PairClassificationTask):
+    """Task class for use with Adversarial Natural Language Inference dataset.
+
+    Configures a 3-class PairClassificationTask using Adversarial NLI data.
+    Requires original ANLI dataset file structure under the relative path.
+    Data: https://dl.fbaipublicfiles.com/anli/anli_v0.1.zip
+    Paper: https://arxiv.org/abs/1910.14599
+
+    Attributes:
+        path (str): AdversarialNLI path relative to JIANT_DATA_DIR
+        max_seq_len (int): max tokens allowed in a sequence
+        train_data_text (list[list[str], list[str], list[int]]):
+            list of lists of context, hypothesis, and target training data
+        val_data_text (list[list[str], list[str], list[int]]):
+            list of lists of context, hypothesis, and target val data
+        test_data_text (list[list[str], list[str], list[int]]):
+            list of lists of context, hypothesis, and target test data
+        datasets (list[str]): list of sub-datasets used in task (e.g., R1)
+        sentences (list): list of all (tokenized) context and hypothesis
+            texts from train and val data.
+    """
+
+    def __init__(self, path, max_seq_len, name, datasets, **kw):
+        """Initialize an AdversarialNLITask task.
+
+        Args:
+            path (str): AdversarialNLI path relative to the data dir
+            max_seq_len (int): max tokens allowed in a sequence
+            name (str): task name, specified in @register_task
+            datasets (list[str]): list of ANLI sub-datasets used in task
+        """
+        super(AdversarialNLITask, self).__init__(name, n_classes=3, **kw)
+        self.path = path
+        self.max_seq_len = max_seq_len
+        self.train_data_text = None
+        self.val_data_text = None
+        self.test_data_text = None
+        self.datasets = datasets
+
+    def _read_data(self, path: str) -> pd.core.frame.DataFrame:
+        """Read json, tokenize text, encode labels as int, return dataframe."""
+        df = pd.read_json(path_or_buf=path, encoding="UTF-8", lines=True)
+        # for ANLI datasets n=neutral, e=entailment, c=contradiction
+        df["target"] = df["label"].map({"n": 0, "e": 1, "c": 2})
+        tokenizer = get_tokenizer(self._tokenizer_name)
+        df["context"] = df["context"].apply(tokenizer.tokenize)
+        df["hypothesis"] = df["hypothesis"].apply(tokenizer.tokenize)
+        return df[["context", "hypothesis", "target"]]
+
+    def load_data(self):
+        """Read, preprocess and load data into an AdversarialNLITask.
+
+        Assumes original dataset file structure under `self.rel_path`.
+        Loads only the datasets (e.g., "R1") specified in the `datasets` attr.
+        Populates task train_, val_, test_data_text and `sentence` attr.
+        """
+        train_dfs, val_dfs, test_dfs = [], [], []
+        for dataset in self.datasets:
+            train_dfs.append(self._read_data(os.path.join(self.path, dataset, "train.jsonl")))
+            val_dfs.append(self._read_data(os.path.join(self.path, dataset, "dev.jsonl")))
+            test_dfs.append(self._read_data(os.path.join(self.path, dataset, "test.jsonl")))
+        train_df = pd.concat(train_dfs, axis=0, ignore_index=True)
+        val_df = pd.concat(val_dfs, axis=0, ignore_index=True)
+        test_df = pd.concat(test_dfs, axis=0, ignore_index=True)
+
+        self.train_data_text = [
+            train_df["context"].tolist(),
+            train_df["hypothesis"].tolist(),
+            train_df["target"].tolist(),
+        ]
+        self.val_data_text = [
+            val_df["context"].tolist(),
+            val_df["hypothesis"].tolist(),
+            val_df["target"].tolist(),
+        ]
+        self.test_data_text = [
+            test_df["context"].tolist(),
+            test_df["hypothesis"].tolist(),
+            test_df["target"].tolist(),
+        ]
+
+        self.sentences = (
+            train_df["context"].tolist()
+            + train_df["hypothesis"].tolist()
+            + val_df["context"].tolist()
+            + val_df["hypothesis"].tolist()
+        )
+
+        log.info("\tFinished loading ANLI data: " + self.name)
+
+
 @register_task("mnli", rel_path="MNLI/")
 # second copy for different params
 @register_task("mnli-alt", rel_path="MNLI/")